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Article 2 Determination of Exit Requirements

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TABLE 6-1
DETERMINATION OF EXIT AND ACCESS REQUIREMENTS
Occupancy Group of Building or Space Group Designation Maximum Travel Distance (ft.)a Capacity Number of Persons per Unit of Width Corridorsi
Unsprinklered Sprinklered Doors Openingsm Stairs, Escalatorsk Ramps,b Corridors, Exit Passageways,j Horizontal Exits Min. Width (in.) Max. Dead Endh (length in ft.)
To Outdoors at Grade All Other Exit and Corridor Doors
High Hazard A N.P 150 50 40 30 50 36 N.P.
Storage B-1c 100 150 75 60 45 75 36 50
B-2c 125 175 75 60 45 75 36 N.R.
Mercantile C 150 200 100 80 60 100 36 50
Industrial D-1 125 175 100 80 60 100 44 50
D-2 150 200 100 80 60 100 44 50
Business E 200 300 100 80 60 100 44 50
Assembly* F 150 200 100 80 60 100 44 30
Educational G 150 200 100 80 60 100 66e 30d
Institutional H-1 125 175 50 40 30 50 36 40
H-2 125 175 30 30 15 30 96f 30g
Residential J-1 150 200 50 40 30 50 36 40
J-2 150 200 50 40 30 50 36 40
J-3 N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R.
N.P. — Not Permitted
N.R. — No Requirements (except as provided in section 27-375)
*See Table 8-1 for exit and access requirements applying to places of assembly
**Notes:
  1. a For method of measurement, see subdivision (c) of section 27-360 of this article.
  2. b Reduce listed capacity of ramps by twenty-five percent when slope exceeds one in ten.
  3. c Except for public garages. (See article ten of subchapter seven of this chapter.)
  4. dThere shall not be more than one classroom on each side of a corridor between an exit and the end of the corridor (dead end).
  5. e Applies to corridors serving classrooms. Other corridors shall have a minimum width of forty-four inches.
  6. f Applies to corridors serving patients. Other corridors shall have a minimum width of forty-four inches.
  7. g There shall be no patient bedrooms between an exit and the end of the corridor (dead end).
  8. h See subdivision (d) of section 27-369 of article five of this subchapter for permissible increase.
  9. i See section 27-369 of article five of this subchapter.
  10. j See section 27-370 of article five of this subchapter.
  11. k See section 27-378 of article five of this subchapter.
  12. m Where a door opening is divided by mullions into two or more doors openings, each such opening shall be measured separately in computing the number of units of exit width.

**There is no note l.
TABLE 6-2
OCCUPANT LOAD REQUIREMENTS NET AREA TABLE
Occupancy
Net Floor Area per Occupant (sq. ft.)
Billiard rooms............................................................... 
50
Bowling alleys...............................................................
50
Classrooms................................................................... 
20
Dance floors.................................................................
10
Dining spaces (nonresidential)..................................
12
Exhibition spaces........................................................
10
Garages and open parking structures.....................
250
Gymnasiums............................................................... 
15
Habitable rooms ........................................................
140
Industrial shops.......................................................... 
200
In schools................................................................
30
Institutional sleeping rooms
 
Adults.......................................................................
75
Children (except as listed below)......................... 
50
Day Care
 
a. under 6 mos..................................................
50
b. 6 mos. 2 yrs...................................................
40
c. 2 yrs. 6 yrs......................................................
30
Institutional staff, all.................................................
30
Kindergartens............................................................
35
Kitchens (nonresidential).........................................
200
Laboratories..............................................................
50
Preparation rooms...............................................
100
Libraries.....................................................................
25
Locker rooms............................................................
12
Offices........................................................................
100
Passenger terminals or platforms .........................
1.5xC
Sales areas (retail).....................................................
 
1st floor or basement 
25
All other floors ......................................................
50
Seating areas (audience) in all places of assembly
 
Fixed seats..............................................................
D
Moveable seats......................................................
10
Skating rinks ..............................................................
15
Stages (See subchapter eight)..................................
Standing room (audience) in all places of assembly 
4
Storage rooms............................................................ 
200

Notes:

C—capacity of all passenger vehicles that can be unloaded simultaneously.
D—designed number of seats or occupants.
*Dash not enacted but probably intended
§27-357 Exit Requirements
The determination of exit requirements for a building shall be based upon the occupancy group classification of the building, the number of occupants, the floor area, the travel distance to an exit, and the capacity of the exits, as provided in table 6-1 and herein. Every floor of a building shall be provided with exit facilities for its occupant load. The occupant loads of floors shall not be cumulative for the purpose of designing vertical exits, except where one floor is used by another as a means of egress. Vertical exits provided from any floor above grade may serve simultaneously all floors above grade, and vertical exits provided from any floor below grade may serve simultaneously all floors below grade.
  1. Mixed occupancy. When a building is classified in more than one occupancy group in accordance with the provisions of section 27-239 of article two of subchapter three of this chapter, the exit requirements for the entire building shall be determined on the basis of the occupancy group having the strictest exit requirements, or the exit requirements for each building section shall be determined separately.
  2. Incidental occupancies. When a building contains incidental occupancies classified in occupancy groups other than that under which the building is classified, the exit requirements for the floor on which such occupancies occur shall be based upon those of the occupancy group under which the building is classified; but the access and exit requirements for the incidental occupancy shall be based upon the occupancy group classification of the incidental occupancy.
  3. Multiple occupancy or use. Where a building, floor, or space is used for multiple purposes involving different activities at different times, that occupancy involving the greatest number of occupants shall be used in determining the exit requirements.
  4. Building access. All buildings classified in other than occupancy groups A, mechanical and electrical equipment rooms and boiler and furnace rooms of D-2 or J-3 shall have at least one primary entrance accessible to and usable by individuals who use wheelchairs. Such entrance shall provide access to a level that makes elevators available in buildings where elevators are provided. Where ramps are used to comply with this requirement, they shall have a slope not greater than one in twelve, and shall otherwise conform to the provisions of section 27-377 and reference standard RS 4-6.
The commissioner may waive the requirements of this section in the alteration of buildings existing on the effective date of this code in accordance with section 27-292.6 of this code.
§27-358 Occupant Load
The number of occupants for whom exit facilities shall be provided shall be established either (1) by the actual number of occupants for whom each occupied space, floor, or building, as the case may be, is designed, or (2) by using the appropriate occupant-area ratios from table 6-2, whichever is larger. The occupant load of any space shall include the occupant load of all spaces that discharge through it in order to gain access to an exit.

(a) Unlisted occupancies. Where data regarding the sq. ft. per person for an occupancy is not listed in table 6-2, the occupant load shall be established by an architect or engineer, subject to the approval of the commissioner.

(b) Modifications.

(1) When the actual occupant load of any space will be significantly lower than that listed in table 6-2, the commissioner may establish a lower basis for the determination of the occupant load.

(2) When a building existing on December sixth, nineteen hundred sixty-eight is altered or changed in occupancy or use so as to require enlarged exit facilities, the commissioner may authorize the alteration or change in occupancy or use without an enlargement of exit facilities, provided the occupant load is limited to that accommodated by the existing exit facilities as determined by the provisions of this code, and the building or space is posted accordingly with a sign. Such signs shall be at least twelve inches in width and sixteen inches in height. The lettering shall be red on a white background. The letters shall be not less than one inch high and the numerals not less than one and one-quarter inches high.

(c) Nonsimultaneous occupancy. The occupant load of toilets, locker rooms, meeting rooms, storage rooms, employee cafeterias, and similar rooms or spaces that are not occupied at the same time as other rooms or spaces on the same floor of a building, may be omitted from the occupant load calculation of the floor on which they are located to the extent that such spaces serve occupied rooms on the same floor.
§27-359 Capacity of Exits
The capacity of exits and access facilities shall be measured in units of width of twenty-two inches, and the number of persons per unit of width shall be determined by the occupancy group classification and type of exit as listed in table 6-1. Fractions of a unit of width less than twelve inches shall not be credited. Where twelve inches or more are added to one or more full units of width, one-half unit of width may be credited. Where computations of total required width give fractional results, the next larger integral number of exit units or integral number plus one-half, shall be used. A fraction less than one-half may be neglected in cases where such fraction constitutes less than ten per cent of the total required number of units. Notwithstanding any of the above computations, no exit or access facility shall be narrower than the minimum width requirements specified in table 6-1, or elsewhere in this code.
§27-360 Travel Distance
(a) General requirement. The maximum travel distance from the most remote point in any room or space to the center of a door opening directly on an open exterior space, a vertical exit, an interior stair, an exit passageway or to a horizontal exit shall not be greater than the limit specified in table 6-1 for the occupancy group classification of the room or space.

(b) Travel distance within dwelling units. In buildings classified in occupancy groups J-1 and J-2, the maximum travel distance from the centerline of a door from any habitable room within a dwelling unit either to the centerline of a door opening on a corridor or to the center of a door opening on an exit shall not be greater than forty feet, except that for buildings classified in occupancy group J-2 of construction class I-A, the distance may be increased to fifty feet. Such travel distances shall be included in the maximum travel distance established in subdivision (a) of this section.

(c) Measurement. Travel distance shall be measured along a natural and unobstructed path of travel. Where the path of travel is over an access stair, it shall be measured along an inclined straight line through the center of the outer edge of each tread.

Related Code Sections

Article 2 Means of Egress, Determination of Exit Requirements
TABLE 6-1 DETERMINATION OF EXIT AND ACCESS REQUIREMENTS Occupancy Group of Building or Space Group Designation Maximum Travel Distance (ft ...