Subchapter 1 Administration and Enforcement

Subchapter 2 Definitions

Subchapter 3 Occupancy and Construction Classification

Subchapter 4 Building Limitations

Subchapter 5 Fire Protection Construction Requirements

Subchapter 6 Means of Egress

Subchapter 7 Special Uses and Occupancies

Subchapter 8 Places of Assembly

Subchapter 9 Loads

Subchapter 10 Structural Work

Subchapter 11 Foundations

Subchapter 12 Light, Heat, Ventilation and Noise Control

Subchapter 13 Mechanical Ventilation, Air Conditioning, and Refrigeration Systems

Subchapter 14 Heating and Combustion Equipment

Subchapter 15 Chimneys and Gas Vents

Subchapter 16 Plumbing and Gas Piping

Subchapter 17 Fire Alarm, Detection and Extinguishing Equipment

Subchapter 18 Elevators and Conveyors

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This subchapter shall establish the minimum safety requirements for, and control the design, construction, installation, alteration, and use of chimneys and gas vents.
The provisions of reference standard RS-15 shall be a part of this subchapter.
For definitions to be used in the interpretation of this subchapter, see subchapter two of this chapter.
For the requirements governing the filing of plans and the work to be shown on plans, see subchapter one of this chapter.
For the requirements governing equipment work permits and equipment use permits, see subchapter one of this chapter.
Chimneys or gas vents shall be designed and constructed so as to provide the necessary draft and capacity to completely exhaust the products of combustion to the outside air, and to satisfy the following conditions:

(a) Temperature. The temperature on adjacent combustible surfaces shall not be raised above one hundred sixty degrees Fahrenheit.

(b) Condensation. The condensation shall not be developed to an extent that can cause rapid deterioration of the chimney or vent.
(a) Factory-built chimneys. Factory-built chimneys and chimney units shall be listed and accepted in accordance with the applicable reference standard and shall be installed in accordance with the temperature conditions and height limitations of the listing and acceptance, the manufacturer's instructions or this article, whichever is the most restrictive. Flue gas temperatures in the chimney shall not exceed the limits and durations employed during listing tests and as required by this code.

(b) Gas vents. Type B and Type BW gas vents shall be listed and accepted in accordance with the conditions of the acceptance and applicable provisions of this code.
(a) Equipment requiring chimneys. All gas-burning equipment that produces flue gas temperatures in excess of five hundred fifty degrees Fahrenheit or four hundred eighty degrees Fahrenheit above room temperature, and all solid and liquid fuel-burning equipment, shall be connected to chimneys that conform to the requirements of this subchapter.

(b) Chimney construction. Unlisted chimneys shall be constructed of steel, brick, masonry units, concrete, concrete units, or equivalent materials. Chimneys shall be of adequate structural strength, with resistance suitable for the temperatures to which they may be subjected and resistive to the corrosive action of gases. For structural requirements, see subchapters ten and eleven of this chapter.

(c) Separation of flues. Whenever more than one flue is installed within a chimney, the lining of each flue shall be separated, one from the other, as follows:

(1) In low temperature chimneys with fire clay flue linings: by a wythe of cement grout at least one inch thick or other equivalent method.

(2) In medium temperature and high temperature chimneys: by a division wall of brick or concrete at least three and three-quarters inches thick or other equivalent method. The separation between flue linings thus established shall in all cases be adequate to give stability for the chimney construction as required by subchapter ten of this chapter.

(d) Test run. All new chimneys shall be test run by the applicant under operating conditions to demonstrate fire safety and the complete exhausting of smoke and the products of combustion to the outer air. The results of such test run shall be certified as correct by the applicant and shall be submitted in writing to the department.

(e) Requirement of a smoke test. Whenever required by the commissioner after an inspection has been made of the chimney, a smoke test shall be made as outlined in section 27-868 of this article. Any faults or leaks found shall be corrected. Such smoke test shall be witnessed by a representative of the commissioner. In lieu thereof, the commissioner may accept the test report of an architect or engineer in which case the test shall be subject to the provisions for controller inspection except that the architect or engineer may be retained by the contractor.
Chimneys shall be classified as follows:

(a) Low temperature chimneys. Chimneys designed and constructed to exhaust the products of combustion from low temperature equipment as defined in subchapter fourteen of this chapter.

(b) Medium temperature chimneys. Chimneys designed and constructed to exhaust the products of combustion from medium temperature equipment as defined in subchapter fourteen of this chapter.

(c) High temperature chimneys. Chimneys designed and constructed to exhaust the products of combustion from high temperature equipment as defined in subchapter fourteen of this chapter.
Whenever a new chimney is completed or an existing chimney is altered, it shall be cleaned and left smooth on the inside. Cleanouts with a gas tight door shall be provided at the base of all chimneys.
(a) Low temperature chimneys. Low temperature chimneys shall extend at least three feet above the highest construction, such as a roof ridge, parapet wall, or penthouse, within ten feet of the chimney outlet, whether the construction is on the same building as the chimney or on another building. However, such constructions do not include other chimneys, vents, or open structural framing. Any chimney located beyond ten feet from such construction, but not more than the distance determined in subdivision (d) of this section, shall be at least as high as the construction.

(b) Medium temperature chimneys. Medium temperature chimneys shall extend at least ten feet above the highest construction, such as a roof ridge, or parapet wall or penthouse within twenty feet of the chimney outlet, whether the construction is on the same building as the chimney or on another building. However, such constructions do not include other chimneys, and vents. Any chimney located beyond twenty-feet from such constructions but not more than the distance determined in subdivision (d) of this section, shall be at least as high as the construction.

(c) High temperature chimneys. High temperature chimneys shall extend at least twenty feet above the highest construction, such as roof ridge, parapet wall, penthouse, or other obstruction within fifty feet of the chimney outlet, whether the construction is on the same building as the chimney or in another building. However, such constructions do not include other chimneys, vents, or open structural framing. Any chimney located beyond fifty feet from such construction but not more than the distance determined in subdivision (d) of this section, shall be at least as high as the construction.

(d) Formula. The following formula shall be used for determining the distances referred to in subdivisions (a), (b) and (c) of this section:



where:
D = Distance, in ft., measured from the center of the chimney outlet to the nearest edge of the construction.
F = Value determined from table 15-1.
A = Free area, in sq. in., of chimney flue space.

TABLE 15-1
"F" FACTOR FOR DETERMINING CHIMNEY DISTANCES
Type of Fuel “F” Factor
Low
Temp.
Chimney

Medium
Temp.
Chimney

High
Temp.
Chimney

Gas 2 2 3
No. 2 Fuel Oils 2.5 2.5 3
No. 3, No. 6 Fuel Oils,
Solid Fuels and
Incinerators

3 3 3
(a) Responsibility of owner of taller building. Whenever a building is erected, enlarged, or increased in height so that any portion of such building, except chimneys or vents, extends higher than the top of any previously constructed chimneys within one hundred feet, the owner of such new or altered building shall have the responsibility of altering such chimneys to make them conform with the requirements of section 27-859 of this article. A chimney that is no longer connected with a fireplace or combustion or other equipment for which a chimney was required, shall be exempt from this requirement. Such alterations shall be accomplished by one of the following means or a combination thereof:

(1) Carry up the previously constructed chimneys to the height required in section 27-859 of this article.

(2) Offset such chimneys to a distance beyond that required in section 27-859 of this article from the new or altered building, provided that the new location of the outlet of the offset chimney shall otherwise comply with the requirements of this subchapter.

(b) Protection of draft. After the alteration of a chimney as required by subdivision (a) of this section, it shall be the responsibility of the owner of the new or altered building to provide any mechanical equipment or devices necessary to maintain the proper draft in the equipment.

(c) Written notification. The owner of the new or altered building shall notify the owner of the building affected in writing at least forty-five days before starting the work required and request written consent to do such work. Such notice shall be accompanied by plans indicating the manner in which the proposed alterations are to be made.

(d) Approval. The plans and method of alteration shall be subject to the approval of the commissioner.

(e) Refusal of consent. If consent is not granted by the owner of the previously constructed building to do the alteration work required by subdivisions (a) and (b) of this section such owner shall signify his or her refusal in writing to the owner of the new or altered building and to the commissioner; and the owner of the new or altered building has submitted plans that conform to the requirements of this section, he or she shall thereupon be released from any responsibility for the proper operation of the equipment due to loss of draft and for any health hazard or nuisance that may occur as a result of the new or altered building. Such responsibilities shall then be assumed by the owner of the previously constructed building. Likewise, should such owner neglect to grant consent within forty-five days from the date of written request or fail to signify his or her refusal, he or she shall then assume all responsibilities as prescribed above.

(f) Procedure. It shall be the obligation of the owner of the new or altered building to:

(1) Schedule this work so as to create a minimum of disturbance to the occupants of the affected building.

(2) Provide such essential services as are normally supplied by the equipment while it is out of service.

(3) Where necessary, support such extended chimneys and equipment from this building or to carry up such chimneys within his or her building.

(4) Provide for the maintenance, repair, and/or replacement of such extensions and added equipment.

(5) Make such alterations of the same material as the original chimney so as to maintain the same quality and appearance, except where the owner of the chimney affected shall give his or her consent to do otherwise. All work shall be done in such fashion as to maintain the architectural esthetics of the existing building.

(g) Existing violations. Any existing violations on the previously constructed equipment shall be corrected by the owner of the equipment before any equipment is added or alterations made at the expense of the owner of the new or altered building.

(h) The commissioner may grant a variance in accordance with the provisions of section 27-107 of article one of subchapter one of this chapter.
(a) Exterior metal chimneys. Exterior metal chimneys constructed of steel shall be of adequate thickness to resist all applied loads specified in subchapter nine of this chapter, but shall not be less than the thickness required in table 15-4.

(b) Clearances for exterior metal chimneys. Metal chimneys erected on the exterior of a building shall have sufficient clearance from a wall or frame of combustible construction to satisfy the requirements of table 15-2 and to permit inspection and maintenance operations on the chimney, and shall comply with the following minimum requirements:

(1) Exterior metal chimneys over eighteen inches in diameter, for equipment of any operating temperature, shall have a clearance of at least four inches, and those eighteen inches or less in diameter shall have a clearance of at least two inches from a building wall of any combustible construction.

(2) No portion of an exterior metal chimney shall be nearer than twenty-four inches to any door or window or to any exit, or located where it would be readily accessible to the public, unless it is insulated or shielded to avoid injury to any person coming in contact with the chimney.

TABLE 15-2
MINIMUM CLEARANCES REQUIRED FROM ANY COMBUSTIBLE MATERIALS
Classification of Equipment
Low Temperature Medium
Temperature
High Temperature
6” 24” 24”

(c) Enclosure of interior metal chimneys:

(1) Every interior metal chimney or part thereof erected within buildings shall be enclosed with noncombustible construction having a fire resistance rating of not less than that prescribed in table 15-3 in all stories above the one in which the equipment served thereby is located. Where the metal chimney passes through a combustible roof, it shall be guarded by a noncombustible ventilating thimble of galvanized metal or equivalent noncombustible material that extends at least nine inches below and above the roof construction. The thimbles shall be of a size to provide clearances on all sides of the metal chimney of at least six inches for low temperature equipment and at least eighteen inches for medium and high temperature equipment as defined in subchapter fourteen of this chapter. However, if the metal chimney is insulated and protected to prevent a temperature of more than two hundred fifty degrees Fahrenheit on its exterior surface, the thimble clearance may be reduced by fifty percent.

(2) The enclosure around a metal chimney shall provide a space on all sides of the chimney to permit inspection and repair for the entire chimney height. When metal chimneys have a minimum dimension of twenty-four inches in diameter and are completely jacketed with noncombustible insulating material within the required enclosure, access to permit inspection and repair shall not be required.

(3) The enclosing construction shall be of noncombustible materials and shall have a fire resistance rating as required in table 15-3 and shall be without openings, except access openings equipped with opening protectives constructed in accordance with the requirements of subchapter five of this chapter, at floor levels where necessary for complete inspection purposes.

(4) The required fire resistance ratings of table 15-3 for the enclosure of a medium or high temperature metal chimney may be reduced by one hour if the chimney is insulated with an insulation adequate for the temperature of the chimney and having at least a one hour fire resistance rating at all sections of the insulation.

** TABLE 15-3
REQUIRED FIRE RESISTANCE RATINGS OF ENCLOSURES FOR METAL CHIMNEYS
Chimney
Classification
Required Fire Resistance
Rating of Enclosure
Low Temperature 1 Hr. for buildings under 5 stories
2 Hr. for buildings 5 stories or more
Medium Temperature 2 Hr.
High Temperature 3 Hr.

Note for Table 15-3: Table 3-4 of section 27-271 shall also be complied with in the construction of enclosures for metal chimneys.
**Local Law 80-1989.

(d) Prohibited location. No interior metal chimney shall be carried up inside a ventilating duct unless such duct is constructed as required by this subchapter for metal chimneys, and only when such duct is used solely for exhaust venting the room or space in which the equipment served by the metal chimney is located. Metal chimneys shall not be installed in air supply ducts.

(e) Unlisted metal chimneys serving residential type or low heat appliances and producing flue gas having a temperature below 350°F at the entrance to the chimney at full load or partial load shall be lined with acid and condensate resistant refractory material, or constructed of suitable stainless steel, or otherwise protected so as to minimize or prevent condensation or corrosion damage as required in reference standard RS 15-14.

(f) Steel chimneys for exterior use shall be insulated and weather sheathed to maintain flue surface temperatures above the acid dew point in all parts of the system in accordance with subdivision (b) of section 27-854.

(g) Steel chimneys for interior use shall be insulated to ensure enclosure temperatures not in excess of 160°F on combustible materials in accordance with subdivision (a) of section 27-854.
Materials other than metal for the construction of chimneys shall include the following:

(a) Clay, concrete, or shale bricks, laid in a full bed of mortar.

(b) One hundred per cent solid masonry units, or hollow masonry units having the cores filled with mortar or grout, laid in spread mortar covering the entire cross-sectional area of the unit.

(c) Concrete cast in place and adequately reinforced where required.

(d) Natural stones that have been sawed, dressed, or have a tooled finish, laid in spread mortar.

(e) Perforated radial brick. Such brick shall be laid in spread mortar equal to type M, of reference standard RS 15-3, and shall be shaped to the circular and radial lines of the various sections so as to form even joints.

(f) Other equivalent materials or combination of materials.
(a) Unlisted chimneys for low temperature equipment shall be constructed in accordance with table 15-4.

(b) Unlisted chimneys for medium temperature equipment shall be constructed in accordance with table 15-5.

(c) Unlisted chimneys for high temperature equipment shall be constructed in accordance with table 15-6.

(For table 15-4 see chapter 839 of the laws of 1986)

Notes:

a Metal chimneys shall be of riveted, bolted or welded construction and made gas tight.

b Exterior metal chimneys shall be galvanized, or painted on the exterior surface with a heat resisting paint or be constructed of equal corrosion resistive alloys.

c In buildings in residential occupancy group J-3, of four stories or less, and in other buildings not over two stories high and not in high hazard occupancy group A, providing the flue areas are not more than 200 sq. in. the walls of masonry or concrete chimneys may be reduced to 4 in. with fire clay flue lining. Flue linings shall be set ahead of chimney walls, and carefully bedded in fire clay mortar or in cement mortar. Chimney walls shall be provided with mortar spacer ties every 10 ft. of height. Mortar ties shall not be continuous around the flue linings.

TABLE 15-4
LOW TEMPERATURE CHIMNEY CONSTRUCTIONS

Material Thickness Lining Required Type of Lining Thickness Air Space
Steela (for
exterior
chimneys)b

1/8 in. for areas up to 7
sq. ft., 3/16 in. for
areas up to 12.5 sq. ft.,
1/4 in. for larger.


Not required …. …. ….
Steela (for
interior
chimneys)

No. 16 U.S. gage for
areas up to 155 sq. in.,
No. 14 U.S. gage up to
200 sq. in., No. 12
U.S. gage up to 255
sq. in., No. 10 U.S.
gage for greater areas.





Not required …. …. ….
Brick,
masonry
units, or stone

8 inchesc Full height from
chimney base to
4 in. above
chimney walls.


Clay flue lining meeting
requirements of Reference
Standard RS 15-4, with fire clay
mortar or cement mortar equal to
that of Type M of Ref. Std. RS
15-3, or a heat-proof and acid proof
flue lining joint cement.





Not less
than 5/8
in.

Not less than 1/4
in. nor more
than 3/4 in.
between
chimney walls
and flue lining




Concrete 6 inchesc ditto ditto ditto ditto
Radial brick 7 ½ inches Full height from
chimney base to
4 in. above
chimney wall.


Firebrick Type G, RS 15-6, laid
in medium refractory mortar,
RS 15-7, or acid resistant brick
Type H or L, Ref. Std. RS 15-8.


4 1/2
inches
….
Brick type H
or L, RS 15-7
8 inches Not required …. …. ….

Notes for Table 15-4:
a Metal chimneys shall be of riveted, bolted or welded construction and made gas tight.
b Exterior metal chimneys shall be galvanized, or painted on the exterior surface with a heat resisting paint or be constructed of equal corrosion resistive alloys.
c In buildings in residential occupancy group J3, of four stories or less, and in other buildings not over two stories high and not in high hazard occupancy group A, providing the flue areas are not more than 200 sq. in. the walls of masonry or concrete chimneys may be reduced to 4 in. with fire clay flue lining. Flue linings shall be set ahead of chimney walls, and carefully bedded in fire clay mortar or in cement mortar. Chimney walls shall be provided with mortar spacer ties every 10 ft, of height. Mortar ties shall not be continuous around the flue linings.


*TABLE 15-5
MEDIUM TEMPERATURE CHIMNEY CONSTRUCTIONS

Material Thickness Lining Required Type of Lining Thickness Air Space
Steel Same as for
low temp.
chimney

Lining is required
for full height of
chimney.

Incinerators only Castable
refractory
Cl A, RS 15-5

Medium-duty fireclay
refractory brick
(ASTM C64) or the
equivalent laid in
medium-duty
refractory mortar
(ASTM C105) or the
equivalent, RS 15-6.











2 inches


The lining shall be at least
2 ½ in. thick for chimneys
having a diameter or greatest
cross-section dimension of 18
in. or less. The lining shall have
a thickness of not less than 4
½ in. laid on a full bed for
chimneys having a diameter
or greatest cross-section
dimension greater than 18 in.












None required
Brick or
masonry
units

8 inches Full height from
chimney base to 4
in. above chimney
wall.


Firebrick Type G, RS
15-6 laid in medium
refractory mortar, RS
15-7, or acid resistant
brick Type H or L,
Ref. Std. RS 15-8.




4 ½ inches None required
Concrete 6 inches ditto ditto ditto ditto
Stone 12 inches ditto ditto ditto ditto
Radial
brick
7 ½ inches Full height from
chimney base to 4 in.
above chimney wall.

ditto ditto ditto
Brick
masonry
units,
stone, or
concrete



Double wall
construction,
each wall 8
inches thick


From 2 feet below
to a height of 25 feet
above the point of
entry if connector,
the inner wall shall
be lined.




Fire clay flue lining,
as required for low
temperature masonry
chimneys.


5/8 inch 2 in. air space
between each 8 in.
wall, fire-stopped
at each floor with
non-combustible
material.





*Local Law 80-1989.
No solid fuel fireplace, fireplace stove or room heater shall be installed or altered unless connected to a chimney which complies with the limitations and testing requirements set forth in table 15-6.1.
*Local Law 80-1989.

*TABLE 15-6
HIGH TEMPERATURE CHIMNEY CONSTRUCTIONS

Material Thickness Lining Required Type of Lining Thickness Air Space
Steel Same as for low
temp. chimney
For full height of
chimney
High-duty fireclay
refractory brick
(ASTM C64) or the
equivalent not less
than 4 ½ in. thick
laid on a full width
bed in high- duty
refractory mortar
(ASTM C105) or the
equivalent, RS 15-6.








4 ½ inches None required
Brick masonry
or concrete
Double wall
construction
with each wall 8
inches thick and
an intervening
air space




Inner course of
inner wall shall be
a firebrick, form 2
feet below connector
to full height of
chimney




Firebrick same as
above for steel
chimneys, except no
castable refractory
permitted.



4 ½ inches 2 in. air space required
between the two 8 in.
walls, fire-stopped as for
medium temperature
chimneys



Steel and masonry,
or concrete
single wall.
(Steel on inside
of chimney)



Steel as above,
with a single 8 in.
masonry or 6 in.
concrete wall and
an intervening
air space.




For full height of
chimney
Firebrick and castable
refractory, same as
above for steel
chimneys.


4 ½inches


2 inches


2 in. air space required
between the steel and the
masonry or concrete wall,
fire-stopped as per
medium temperature
chimneys.




Radial Brick 7 ½ inches For full height
from chimney
base to 4 in. above
chimney wall.


Firebrick as above
for steel chimneys
except no castable
refractory permitted


4 ½ inches None required


*TABLE 15-6.1
CHIMNEY LIMITATIONS AND TESTS FOR SOLID FUEL FIREPLACES, FIREPLACE STOVES AND ROOM HEATERS

Occupancy Reference
Standard
Test Standard Temperature Number of Tests
J-2 & J-3 limited to 40
feet and three stories
RS 15-15 UL 127, as
Modified
1700°F 1 test
J-2 & J-3 limited
to 75 feet
RS 15-9 UL 103HT 2100°F —10 min. 3 tests
RS 15-12 ULC 629M 2100°F —30 min. 3 tests
All other
occupancies and
all buildings
greater than 75 feet
in height



RS 15-10 UL 959 2100°F to Equilibrium
and 2300°F —30 min.
1 test
3 tests
Table 15-6 of
subdivision (c) of
section 27-863 and
Section 27-861


No Standard Unlisted High Temp.
Chimney with Required
Thickness listed in
Table 15-6


No test

Notes for Table 15-6.1:
Chimneys accepted pursuant to reference standard RS 14-10 or Table 15-6 may be used in lieu of chimneys accepted pursuant to reference standards RS 15-9, RS 15-12, and RS 15-15.
Chimneys accepted pursuant to reference standards RS 15-9 or RS 15-12 may be used in lieu of chimneys accepted pursuant to reference standard RS 15-15.
*Local Law 80-1989.*Local Law 80-1989.
(a) Chimneys shall not be supported by the equipment they serve unless such equipment has been specifically designed for such loads.

(b) An exterior metal chimney shall be supported on an independent substantial masonry or concrete foundation designed in accordance with the provisions of subchapters ten and eleven of this chapter. Interior metal chimneys may be supported on noncombustible construction at intermediate levels.

(c) Masonry and concrete chimneys may be designed and constructed as free standing, or as constituting an integral part of a wall, or may be enclosed within a structure without constituting a component part thereof.

(d) Masonry and concrete chimneys shall be wholly supported on noncombustible construction that shall conform to the requirements of subchapters ten and eleven of this chapter, and shall not be required to support any direct load other than the weight of the chimney. No supports shall project into the chimney flue or flue lining.

(e) Supports for listed chimneys shall be listed and installed in accordance with the listing and acceptance.
All masonry chimneys shall be capped with concrete, cement wash, terra cotta tile, or other equivalent material.
Walls less than twelve inches thick shall not be corbelled. The maximum horizontal projection in any corbel shall be one inch for each two inches of vertical projection and in all cases the total projection shall not be greater than one-third of the minimum thickness of the wall to be corbelled. In no case shall the total projection be more than six inches. No masonry chimney shall be corbelled from hollow or cavity wall masonry units.
(a) All wood beams, joists, and studs shall be framed away from chimneys. Headers, beams, joists, and studs shall be at least two inches from the outside face of a chimney or from masonry enclosing a flue. Trimmers shall be not less than five inches from the inside face of the concrete or masonry chimney wall. Finished flooring shall have at least one-half inch clearance from chimney walls.

(b) A clearance of at least four inches shall be provided between the exterior surfaces of masonry or concrete chimneys for commercial and industrial type incinerators and combustible material.

(c) A clearance of at least two inches shall be provided between the exterior surfaces of interior masonry or concrete chimneys for all wood burning appliances.

(d) No combustible lathing, furring, or plaster grounds shall be placed against a chimney at any point more than one and one-half inches from the corner of the chimney; but this shall not prevent plastering directly on masonry or on metal lath and metal furring nor shall it prevent placing chimneys for low temperature equipment entirely on the exterior of a building against the sheathing.

(e) All spaces between chimneys and wood joists, beams, or headers shall be firestopped in accordance with the provisions of subchapter five of this chapter.

(f) No change in the size or shape of a chimney shall be made within six inches of the roof framing through which it passes.
(a) General. When required by the commissioner to determine the tightness of chimney construction, a smoke test shall be made in accordance with the following conditions and requirements:

(1) The equipment, materials, power and labor necessary for such test shall be furnished by, and at the expense of, the owner or holder of the work permit.

(2) If the test shows any evidence of leakage or other defects, such defects shall be corrected in accordance with the requirement of this subchapter and the test shall be repeated until the results are satisfactory.

(b) Method of test. The chimney shall be filled with a thick penetrating smoke produced by one or more smoke machines, or smoke bombs, or other equivalent method. As the smoke appears at the stack opening on the roof, such opening shall be tightly closed and a pressure equivalent to one-half inch column of water measured at the base of the stack, shall be applied. The test shall be applied for a length of time sufficient to permit the inspection of the chimney.
(a) Exhaust pipe construction. The exhaust pipe from internal combustion engines shall be constructed in accordance with the requirements for metal chimneys based on the temperature of the gases entering the exhaust pipe, and in accordance with the following:

(1) The requirements for at least a medium temperature chimney shall apply.

(2) The exhaust pipe shall be constructed of at least three-sixteenths inch steel, or of other equivalent metal of similar strength and resistance to the temperature and corrosive action of the exhaust gases.

(3) No lining shall be required.

(4) Where the exhaust pipe runs inside a building, it shall be insulated with an insulation adequate for the temperature of the pipe, so that the surface temperature shall be not more than two hundred degrees Fahrenheit.

(5) All joints shall be constructed so as to be gastight under all operating conditions. No threaded joints shall be permitted in pipe sizes over four inches or in pipe of a thickness less than that of schedule 40 steel pipe.

(b) Location of discharge opening. The location of the discharge opening of the exhaust pipe shall comply with the requirements of subdivision (d) of section 27-776 of article one of subchapter thirteen of this chapter, and, in addition, the opening shall be located or arranged so that it cannot cause condensate leaving the outlet to come in contact with people. The exhaust pipe may be connected to a chimney used for other equipment, provided that the operation of the engine does not adversely affect the operation of the other equipment so as to cause a fire or health hazard, or to cause the emissions from the chimney to be in violation of the air pollution control code.
(a) Residential occupancy. In residential occupancy groups J-2 and J-3:

(1) Factory-built chimneys servicing liquid or gas fueled appliances shall be listed and accepted in accordance with reference standard RS 15-8.

(2) Factory-built chimneys servicing wood burning fireplaces or stoves and inserts shall be listed and accepted in accordance with reference standards RS 15-9, RS 15-10, RS 15-12 or RS 15-15.

(3) Factory-built chimneys servicing factory-built fireplaces shall be listed and accepted in accordance with reference standard RS 15-15.

(b) Other occupancies. In all other occupancy groups:

(1) Factory-built chimneys servicing liquid or gas fueled appliances shall be listed and accepted in accordance with reference standard RS 15-10 or RS 15-11.

(2) Factory-built chimneys servicing wood burning appliances of any type shall be listed and accepted in accordance with reference standard RS 15-10.

(c) Enclosures. All factory-built chimneys shall be enclosed in accordance with the requirements of table 15-3.

(d) Height limitation: Every chimney servicing a factory-built fireplace or wood burning stove in a building of more than seventy-five feet in height shall be listed and accepted in accordance with reference standard RS 15-10, unless such chimney is an unlisted high temperature chimney constructed in accordance with the requirements of section 27-861 and of table 15-6 of subdivision (c) of section 27-863, and is installed to serve the appliance.
(a) Conversion from gas to fuel oil or wood for heating appliances shall be made only if:

(1) the chimney design meets the requirements of this subchapter for the conversion fuel; and

(2) the chimney size is adequate to vent the combustion products from the new fuel.

(b) Conversion from solid or liquid fuels to natural gas fuels for heating appliances shall be made only if:

(1) the chimney design meets the requirements of this subchapter for the conversion fuel;

(2) the chimney is thoroughly cleaned prior to the conversion to remove collected flue deposits, which can spall off when gas is used as a fuel;

(3) the chimney size is recalculated for the new fuel;

(4) drains are installed to remove condensed water; and

(5) gas vents are installed within the chimney for venting purposes if required by the appliance listing.
Conversion from one fuel to another or the use of an existing chimney to service a fireplace or wood burning appliance may require a flue size change for proper operation. This may be done if the redesigned flue meets the criteria for the fuel and chimney type to be used as set forth in this subchapter.

(a) Individual fireclay flue linings, in conformance with reference standard RS 15-14 or the equivalent not less than five-eighths inch thick, may be used but shall be carefully bedded one on the other in medium-duty fireclay refractory mortar in conformance with reference standard RS 15-6 or the equivalent as determined by the commissioner, with close fitting joints left smooth on the inside. Linings shall be separate from the chimney wall and the space between the liner and masonry shall not be filled; only enough mortar shall be used to make a good joint and hold the liners in position.

(b) Cast in place chimney linings.

(1) Cast in place linings shall be installed in accordance with reference standard RS 15-16 and with their listing and acceptance.

(2) The applicant prior to the installation of the lining shall verify that the chimney meets the requirements of reference standard RS 15-4 and is in a sound and uncracked condition, that spalling has been removed and that there are no carbon or creosote deposits.
Chimney connectors except those serving incinerators shall be constructed of galvanized steel of thickness conforming to the requirements listed in subdivision(a) of this section or of equivalent materials. Cleanout doors of the same material as the connector or other equivalent means shall be provided for the cleaning of connectors. Tile pipe shall not be used as a chimney connector.

(a) Thickness of metal. The thickness of galvanized steel for chimney connectors shall be not less than that given in table 15-7.

(b) General. All chimney connectors shall be as short and as straight as possible consistent with their use and the required draft conditions. No chimney connector shall pass through a floor or ceiling construction.

TABLE 15-7
REQUIRED THICKNESS OF GALVANIZED STEEL FOR CONNECTORS

Galvanized Sheet Gage No. Area of Connector Sq. In.
24 less than 79
22 80 to 154
20 155 to 200
16 Over 200
In entering a flue in a masonry or metal chimney, the chimney connector shall be installed above the extreme bottom to avoid stoppage and in such manner or by such means as to prevent the chimney connector from entering so far as to restrict the space between its end and the opposite wall of the chimney. The chimney connector shall be firmly attached or inserted into a thimble or slip joint to prevent it from falling out of place. All connectors shall fit tightly. Chimney connections to any flue shall be limited to one floor. Two or more chimney connectors may be joined to a single connection provided that the chimney connectors are on one floor level and the flue is of sufficient size to serve all of the equipment thus connected. Chimney connectors shall be inspected at the time of the initial installation by the commissioner or by a duly authorized insurance company as provided in section two hundred four of the labor law.
(a) From combustible construction. The minimum distance between the chimney connector and any combustible material or construction shall be:

(1) eighteen inches for chimney connectors from low temperature equipment.

(2) thirty-six inches for chimney connectors from medium temperature and high temperature equipment.

(b) Reduced clearances. The above clearances may be reduced as outlined in table 15-8 in accordance with the type of protection applied to the combustible material or construction.

* TABLE 15-8
REDUCED CLEARANCES FOR CHIMNEY CONNECTORS WITH SPECIFIED FORM OF PROTECTION1, 2, 3, 4

Type of protection
Applied to the combustible material and covering all
surfaces within the distance specified as the required
clearance with no protection. Thicknesses are minimum


Where the required clearance with no protection is:
36 in. 18 in. 9 in. 6 in.
(a) 0.027 in. (23 gage) [sic] sheet metal spaced out 1in. 36 in. 18 in. 9 in. 6 in.
(b) 3 ½ in. thick masonry wall spaced out 1 in. and
adequately tied to the wall being protected. (see Note 4.)
18 in. 9 in. 4 in. 2 in.
(c) 0.027 in. (23 gage) [sic] sheet metal on 1 in. mineral wool
batts reinforced with wire or equivalent spaced out in 1 in.
12 in. 3 in. 2 in. 2 in.

Notes for Table 15-8:
1 Spacers and ties shall be of noncombustible material.
2 All methods of protection require adequate ventilation between protective material and adjacent combustible walls and ceilings.
3 Mineral wool batts (blanket or board) shall have a minimum density of 8 lb. per cu. ft. and a minimum melting point of 1500ºF.
4 If a single wall connector passes through the masonry wall there shall be at least 1/2 in. open ventilated airspace between the connector and the masonry.
*Local Law 80-1989.
Underground chimney connectors shall be covered with at least twelve inches of solid masonry or an equivalent insulation. Each cleanout opening shall be provided with double iron doors or covers, and the doors or covers shall be twelve inches apart with the intervening space filled with insulating material. The doors or covers shall be not less than 10 manufacturers standard gauge. No combustible flooring shall be permitted over such connectors.
Chimney connectors for boilers subject to section two hundred four of the labor law shall be inspected at least once a year by the commissioner or by a duly authorized insurance company, as provided in subdivision (b) of section 27-793 of article two of subchapter fourteen of this chapter and shall be subject to procedures listed therein.
Charging chutes shall be constructed in accordance with the following requirements:

(a) Directly connected. When directly connected to the combustion chamber of an incinerator, the chutes shall be gas tight with smooth linings and shall conform to the following:

(1) They shall be constructed in accordance with the requirements for medium temperature chimneys.

(2) They shall extend through the building roof and be open to the outer air. The opening shall be equal to the required chute size at the top floor.

(3) If a roof damper is used it shall be constructed to open automatically under conditions of excessive pressure or temperature. The roof damper shall be electrically interlocked with the auxiliary burners.

(4) Each charging chute shall be provided with a spark arrester of corrosion resistive, noncombustible construction in which the maximum size of mesh opening shall not exceed three-quarters of an inch. The cross-sectional free area of such arrester shall be not less than that of the inside of the chute to which it is attached. The height of the spark arrester shall be such that there will be a minimum of twenty-four square feet of total free area provided for a chute height to sixty feet; thirty-six square feet for a chute height from sixty-one feet to one hundred twenty feet; and forty-four square feet for chute heights over one hundred twenty feet. In no case, however, shall the height of the spark arrester be less than one foot.

(5) Provisions shall be made for sterilizing the charging chute by heating or purging at a temperature of at least four hundred degrees Fahrenheit but not higher than one thousand degrees Fahrenheit.

(b) Not directly connected. When not directly connected to a building service incinerator, the chutes shall be gas tight with smooth linings and shall conform to the following:

(1) They shall be constructed in accordance with the applicable requirements for shafts in table 3-5 and subchapter five of this chapter.

(2) They shall extend through the building roof and be open to the air. The opening shall be equal to at least one square foot.

(3) If a roof damper is used it shall be constructed to open automatically under conditions of excessive pressure or temperature.

(4) Provisions shall be made for sterilizing the chute by spraying, washing, or other equivalent means.

(5) Bins, containers, or rooms for receiving rubbish shall be constructed as required by section 27-837 of article eighteen of subchapter fourteen of this chapter and sprinklers shall be provided as required by the construction provisions of subchapter seventeen of this chapter.

(c) Sizes.

(1) The sizes of chutes directly connected to the incinerators in buildings shall conform to table 15-9.

(2) Charging chutes not directly connected to the incinerator shall have a cross-sectional free area adequate for the service intended.

(d) Charging doors. Charging doors, service openings, or hopper doors for chutes may be located in separate rooms or compartments enclosed in non-combustible walls or partitions, floors, and ceilings having a fire resistance rating of at least one hour and a self-closing fire door with a three-quarter-hour fire-protection rating. Service openings shall, in no case, have a free area of more than one-third of the cross-sectional free area of the chute to which they give access. All such openings shall be substantially constructed of steel or the equivalent metal of sufficient thickness to prevent distortion or other damage in normal usage. The door shall be provided with counterweights, door checks, or other equivalent means for automatically closing after use and where the chute is connected directly to the combustion chamber of an incinerator, the door shall be so constructed that the chute is closed off while the hopper is being loaded. No part of the door shall project into the chute at any time. The minimum height of charging door openings shall be eleven inches, and the minimum width shall be thirteen inches.

(e) When charging chutes are located in multiple dwellings, in addition to the requirements of this subchapter, the chutes shall be constructed in accordance with the requirements for noise control of chutes in subchapter twelve of this chapter.

TABLE 15-9
MINIMUM SIZE OF CHARGING CHUTES

Building Height Location If Square If Round
7 stories or less All 7 stories 22 ½" x 22 ½" 24" dia.
8 to 30 stories Top 7 stories 22 ½" x 22 ½" 24" dia.
8th to 30th from
the top
27" x 27" 30" dia.
31 stories and
over
Top 7 stories 22 ½" x 22 ½" 24" dia.
8th to 30th from
the top
27" x 27" 30" dia.
Remaining
lower
32” x 32" 36" dia.
Chimneys for building service incinerators shall be constructed in accordance with the requirements of this subchapter for high or medium temperature chimneys, based upon the temperature of the flue gases leaving the equipment, except that no reduction of flue gas temperature shall be recognized if such reduction is the result of using water scrubbers or barometric dampers. In addition, such chimneys shall comply with the following:

(a) Chimneys shall extend through the roof and be open to the air.

(b) Chimneys shall be provided with a spark arrester as required in paragraph four of subdivision (a) of section 27-875 of this article.

(c) Incinerators may discharge into chimneys serving other equipment provided such combined chimney is of adequate size for both uses, conforms to construction required for the highest temperature, and adequate draft control equipment is provided for each device connected to the combined chimney.
Chimneys for central incinerator plants shall be constructed in accordance with the requirements for:

(a) Medium temperature chimneys if the incinerator is provided with a heat recovery unit or other means to assure a flue gas temperature not in excess of one thousand degrees Fahrenheit at the base of the stack.

(b) High temperature chimneys if the incinerator has no heat recovery unit or other means to assure a flue gas temperature less than one thousand degrees Fahrenheit.
(a) The chimney connector from the combustion chamber of an auxiliary fuel-fired incinerator shall be constructed of metal at least as heavy as no. 16 manufacturers standard gauge when twelve inches or less in diameter or greater dimension, and of metal at least as heavy as no. 12 manufacturers standard gauge when they exceed twelve inches in diameter or greater dimension.

(b) Chimney connectors from auxiliary fuel-fired incinerators shall be lined with firebrick, laid in fire clay mortar, at least two and one-half inches thick when they are between twelve inches and eighteen inches in diameter or greater dimension and at least four and one-half inches thick when they are larger; where no flue gas temperature reduction is effected the chimney connectors shall be equipped with a guillotine or horizontal sliding damper or butterfly damper interlocked with the fuel firing controls so that operation of the incinerator occurs when the damper is open. If chimney connectors from auxiliary fuel-fired incinerators lead into and combine with chimney connectors from other equipment, the connectors from the other equipment shall also be lined as required for direct flue connections unless the cross-sectional area of the connector into which they lead is at least four times their required cross-sectional area.

(c) Chimney connectors for an auxiliary fuel-fired incinerator to a boiler stack or chimney for a high temperature heating equipment shall be permitted when the cross-sectional area of such stack or chimney is at least four times that of the incinerator chimney connector.

(d) The clearance of incinerator chimney connectors from combustible material or construction shall be at least thirty-six inches. This clearance may be reduced as outlined in table 15-8 in accordance with the type of protection applied to the combustible material or construction.
(a) Vent systems of gas-fired equipment shall be so designed and constructed as to completely exhaust the products of combustion to the outdoor air.

(b) When required by the commissioner, gas vents shall be tested to determine fire safety and the adequate exhausting of the products of combustion.

(c) Vents shall be installed if required, in accordance with the applicable standards for gas-fired equipment. See reference standard RS 15-2 for a tabulation of these standards.
(a) Ranges for which a vent is not required by reference standard RS 15-2.

(b) Built-in domestic cooking units for which a vent is not required by reference standard RS 15-2.

(c) Hot plates and laundry stoves.

(d) Type 1 clothes dryers.

(*e) Water heaters with inputs not over five thousand Btu/hr. (See note below.)

(*f) Automatically controlled instantaneous water heaters that supply water to a single faucet which is attached to and made a part of the equipment.

(*g) A single booster type (automatic instantaneous) water heater when designed and used solely for the sanitizing rinse requirements of a national sanitation foundation class one, two or three dishwashing machine, provided that the input is limited to fifty thousand Btu/hr. the storage capacity is limited to twelve and one-half gallons and the heater is installed in a commercial kitchen having a mechanical exhaust system.

(*h) Refrigerators.

(*i) Counter equipment.

(*j) Room heaters for which a vent is not required by reference standard RS 15.0.

(*k) Other equipment for which a vent is not required and which are not provided with flue collars.

(*l) Specialized equipment of limited input such as laboratory burners or gas lights.

Note: When any, or all, of the equipment marked with an asterisk (*) is installed so that the aggregate input rating exceeds thirty Btu/hr. per cubic foot of room or space in which it is installed, one or more pieces of the equipment shall be provided with a venting system or other equivalent means for removing the vent gases to the outdoor air so that the aggregate input rating of the remaining unvented equipment does not exceed the thirty Btu/hr. per cubic foot figure. When the room or space in which such equipment is installed is directly connected to another room or space by a doorway, archway, or other opening of comparable size, which cannot be closed, the volume of such adjacent room or space may be included in the calculations.
(a) All vented equipment, except dual oven type combination ranges, equipment with sealed combustion chambers, and units designed for power burners or forced venting, shall be installed with a draft hood or with a barometric damper.

(b) The draft hood supplied with, or forming a part of, vented equipment shall be installed in accordance with the requirements of the applicable standard in reference standard 15-2. The draft hood shall be located in the same room as the combustion air opening of the equipment.
When venting of gas-fired equipment is provided for by the use of chimneys, such chimneys shall be constructed in accordance with the requirements of this subchapter.
Automatically controlled gas-fired equipment connected to a chimney that also serves equipment for the combustion of solid or liquid fuel shall be equipped with an automatic pilot. A gas-fired equipment vent connector and a chimney connector from equipment burning another fuel, located on the same floor, may be connected into the same chimney through separate openings, or may be connected through a single opening if joined by a suitable fitting located as close as practicable to the chimney. If two or more openings are provided into one chimney, they shall be at different levels.
(a) Type B gas vents. Type B gas vents conforming to the requirements of section 27-855 of article one of this subchapter may be used to vent gas-fired equipment. Type B gas vents may be used for single-story or multi-story installations when they conform to the requirements of section 27-855 of article one of this subchapter and the gas equipment used in multi-story installations shall be accepted for such use. Type B gas vents shall be used to vent only listed gas appliances with draft hoods and other gas appliances listed for use with Type B gas vents. However, Type B gas vents shall not be used for venting:

(1) vented wall furnaces listed for use with Type BW gas vents only;

(2) incinerators;

(3) appliances which may be converted readily to the use of solid or liquid fuels;

(4) combination gas-oil burning appliances;

(5) appliances listed for use with chimneys only.

(b) Type B-W gas vents. Type B-W gas vents conforming to the requirements of section 27-855 of article one of this subchapter shall be used to vent gas-fired vented recessed heaters. Type B-W gas vents may be used with single-story or multi-story installations when they conform to the requirements of section 27-855 of article one of this subchapter and the gas equipment used in multi-story installations shall be accepted for such use. Type BW vents shall be used with listed vented gas wall furnaces having a capacity not greater than that of the listed Type BW gas vent.

(c) Single-wall metal vents. Single-wall metal vents may be used to vent gas-fired equipment and shall be constructed of not less than 16 oz. sheet copper, or No. 20 galvanized sheet gauge steel, or of other equivalent noncombustible corrosion-resistive material. Single-wall metal gas vents may pass through the roof or exterior wall to the outdoor air, but shall not pass through any attic or other concealed space nor through any intermediate floor construction.

(d) Connection to a common vent. Connection of gas-fired equipment on more than one floor level to a common vent, except as provided for in subdivisions (a) and (b) of this section, shall be prohibited.

(e) Ventilating hoods. Ventilating hoods and exhaust systems may be used to vent kitchen, laboratory, and commerical equipment.
Gas vents for use with gas-fired equipment, and which are not designed for use with solid or liquid fuel-fired equipment, shall be plainly and permanently identified by a metal label etched or embossed to read: "This gas vent is for equipment which burns gas only. Do not connect to incinerator or solid or liquid fuel-burning equipment." This label shall be attached to the vent at a point near where the gas vent system enters the wall, ceiling, or chimney.
(a) Equipment with sealed combustion chambers. The vent requirements contained in this subchapter do not apply to equipment having sealed combustion chambers and which are so constructed and installed that all air for combustion is derived from outside the space being heated and all flue gases are discharged by integral vent to the outdoors. Such equipment, having integral venting, shall be installed in accordance with the conditions of the applicable standard governing their use.

(b) Gas-vent exhausters and chimney exhausters. Gas-vent exhausters and chimney exhausters may be used with gas appliances in lieu of natural draft vents. Where an exhauster is used with gas-burning equipment requiring venting, provisions shall be made to prevent the flow of gas to the main burner in the event of failure of the exhaust system. A vent connector serving gas equipment vented by natural draft shall not be connected into the discharge side of a power exhauster.

(c) Ventilating hoods and exhaust systems. Ventilating hoods and exhaust systems may be used to vent gas equipment installed in commercial applications. When automatically operated equipment, such as water heaters, are vented through natural-draft ventilating hoods, dampers shall not be installed in the ventilating system. When the ventilating hood or exhaust system is equipped with a power-driven exhaust fan, the equipment control system shall be so interlocked as to permit equipment operation only when the power exhaust is in operation. When used, ventilating hoods shall be built and installed in accordance with the provisions of subchapter thirteen of this chapter.
(a) The gas vent connected to equipment with a single vent shall not be less than the size of the draft hood outlet, and in no case less than two inches in diameter.

(b) When more than one piece of equipment is connected to a gas vent, the area shall be not less than the area of the largest vent connector plus fifty percent of the areas of additional vent connectors or in accordance with the provisions of reference standard RS 15-1.

(c) Where two or more vent connectors enter a common vertical gas vent or chimney, the smaller connector shall enter at the highest level consistent with available headroom or clearance to combustible material. Two or more items of gas equipment may be vented through a common vent connector or manifold located at the highest level consistent with available headroom or clearance to combustible material. The manifold, all junction fittings, and the common vent connector shall be of a size adequate for the combined volume of the vent gases.

(d) Gas vents shall be enclosed as provided in subdivision (c) of section 27-861 of article two of this subchapter.
Gas vents shall extend at least two feet above the highest construction, such as a roof ridge, parapet wall, or penthouse, within ten feet of the vent outlet whether the construction is on the same building as the chimney or on another building. However, such constructions do not include chimneys or other vents, or open structural framing. The vent shall be as high as such construction which is located beyond ten feet from the vent and up to and including the distance determined by the following formula:


where:
D = Distance in ft., measured from the center of the vent outlet to the nearest edge of the construction.
A = Free area, in sq. in., of vent flue space.

Vents shall be subject to the following additional requirements:

(a) No gas vent shall terminate less than five feet in vertical height above the highest connected equipment draft hood outlet or flue collar.

(b) No type B-W gas vent serving a vented recessed heater shall terminate less than twelve feet in vertical height above the bottom of the heater.

(c) All gas vents shall terminate in an approved vent or cowl, which shall prevent down drafts and prevent rain and debris from entering the vent.
(a) Responsibility of owner of taller building. Whenever a building is erected, enlarged, or increased in height so that any portion of such building, except chimneys or vents, extends above the top of a previously constructed gas vent within fifty feet, the owner of the new or altered building shall have the responsibility of altering such gas vents that have their outlets within fifty feet measured horizontally, of any part of the newly erected building. Such alterations shall be at the expense of the owner of the new or altered building and shall be accomplished by one of the following means or a combination thereof:

(1) Carry up such previously constructed vents from gas-fired equipment to the height required in section 27-888 of this article.

(2) Offset such gas vents to a distance of more than fifty feet from the new or altered building, provided that the new location of the outlet of the offset gas vent shall comply with the requirements of this subchapter.

(b) Protection of draft. After the alteration of a gas vent as described in subdivision (a) of this section, it shall be the responsibility of the owner of the new or altered building to provide any mechanical devices or equipment necessary to maintain the proper draft in the equipment.

(c) Written notification. The owner of the new or altered building shall notify the owner of the building affected in writing at least forty-five days before starting the work and request written consent to do such work. Such notice shall be accompanied by a written description or a plan showing how the proposed alterations are to be made.

(d) Approval. The method of correction shall be subject to the approval of the commissioner.

(e) Refusal of consent. If consent is not granted by the owner of the previously constructed or altered building to do the alteration work required by paragraph one of subdivision (a) of this section, such owner shall signify his or her refusal in writing to the owner of the new or altered building and to the commissioner, and the owner of the new or altered building has submitted plans that conform to the requirements of this section, he or she shall thereupon be released from any responsibility for the operation of his or her equipment and for any health hazard or nuisance that may occur as a result of the newly erected or modified building. Such responsibilities shall then be assumed by the owner of the previously constructed building. Likewise, should such owner neglect to grant consent within forty-five days from the date of written request or fail to signify his or her refusal, he or she shall then assume all responsibilities as prescribed above.

(f) Procedures. It shall be the obligation of the owner of the new or altered building to:

(1) Schedule this work so as to create a minimum of disturbance to the occupants of the affected building.

(2) Provide such essential services as are normally supplied by the equipment while it is out of service.

(3) Where necessary, support such extended gas vents from his or her building or carry up such vents within his or her building.

(4) Provide for the maintenance, repair, and/or replacement of such alterations.

(5) Make such alterations of the same material as the original gas vent except where the owner of the vent affected shall give his or her consent to do otherwise. All work shall be done in such fashion as to maintain the architectural esthetics of the existing building.

(g) Existing violations. Any existing violations on the previously constructed equipment shall be corrected by the owner of the equipment before any equipment is added or alterations made at the expense of the owner of the new or altered building.

(h) The commissioner may grant a variance in accordance with the provisions of section 27-107 of article one of subchapter one of this chapter.
All portions of gas vents shall be adequately supported for the weight of the material used and for the applied loads on the vent.
Gas vents extending through outside walls shall not terminate below eaves or parapets.
Vent connectors for conversion burners without draft hoods, or other gas-fired equipment without draft hoods, shall be constructed of materials having resistance to corrosion and temperature not less than that of no. 24 galvanized sheet gauge steel.

(a) Vent connectors used for gas-fired equipment having draft hoods and for conversion burners having draft hoods, shall be constructed of type B gas vent material or materials having resistance to corrosion and temperature not less than that of no. 26 galvanized sheet gauge steel.

(b) The vent connector between the equipment and the vertical gas vent or chimney shall have the greatest possible initial rise consistent with the headroom available in the equipment area and with the required clearance to combustible material. The horizontal run of the vent connector shall be as short as possible and the equipment shall be located as near the gas vent or chimney as practicable. The maximum length of an uninsulated horizontal run of vent connector shall not exceed seventy-five percent of the height of the gas vent or chimney.

(c) No vent connector shall pass through floor or ceiling construction.
(a) Minimum clearance. Minimum clearances at vent connectors to combustible materials shall not be less than those listed in table 15-10.

(b) Reduced clearances. These clearances may be reduced when the combustible construction is protected as provided in table 15-11.

TABLE 15-10
VENT CONNECTOR CLEARANCE[S]* FOR GAS-FIRED EQUIPMENT
Equipment Minimum Distances from Combustible Materials (in.)
Type B Gas Vent Material Other Than Type B Materials
Boiler As required by Std. 6
Warm air furnace As required by Std. 6
Water heater As required by Std. 6
Room Heater As required by Std. 6
Floor furnace As required by Std. 6
Conversion burner (with draft hood) 6 9
Equipment with draft hoods 6 9
Equipment without draft hoods Not Permitted 18

*Copy in brackets not enacted but probably intended.

TABLE 15-11
REDUCED CLEARANCES FOR VENT CONNECTORS WITH SPECIFIED FORMS OF PROTECTIONa

Specified Form of Protectionb Reduced Clearances Where
the Required Clearance with No Protection is:
18 in. 9 in. 6 in.
(a) 1/4 in. asbestos millboard spaced out 1 in.c 12 6 3
(b) 28 gage [sic] sheet metal on 1/4 in. asbestos mill board 12 4 2
(c) 28 gage [sic] sheet metal spaced out 1 in.c 9 4 2
(d) 28 gage [sic] sheet metal on 1/8 in. asbestos millboard
spaced out 1 in.c
9 4 2
(e) 1 1/2 in. asbestos cement covering on heating appliance 18 9 6
(f) 1/4 in. asbestos millboard on 1 in. mineral fiber bats
reinforced with wire mesh or equivalent
6 4 2
(g) 22 gage [sic] sheet metal on 1 in. mineral fiber bats
reinforced with wire or equivalent
3 2 2
(h) 1/4 in. asbestos cement board or 1/4 in. asbestos millboard 18 9 4
(i) 1/4 in. cellular asbestos 18 9 3

Notes for Table 15-11:
a Except for the protection described in (e) above, all clearances should be measured from the outer surface of the appliance to the combustible material disregarding any intervening protection applied to the combustible material.
b Applied to the combustible material unless otherwise specified and covering all surfaces within the distance specified as the required clearance with no protection. Thicknesses are minimum.
c Spacers shall be on** noncombustible material.
**As enacted but “of” probably intended.
(a) When passing through combustible constructions, bent connectors constructed of type B gas vent material shall be installed so that the clearances required by the standard are maintained.

(b) Vent connections made of single-wall metal pipe shall not pass through any combustible walls or partitions unless they are guarded at the point of passage by ventilated metal thimbles not smaller than the following:

(1) For equipment conforming to standards -- four inches larger in diameter than the vent connector.

(2) For equipment having draft hoods -- six inches larger in diameter than the vent connector.

(3) For equipment without draft hoods -- twelve inches larger in diameter than the vent connector.
The vent connector shall not be smaller than the size of the flue collar or the draft hood outlet of the gas-fired equipment. Where a single item of equipment has more than one draft hood outlet, the vent connector shall equal the combined area of the draft hood outlets for which it acts as a common connector to the gas vent or chimney.
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