Exception: Mechanical systems, equipment and appliances are permitted to be located below the design flood elevation provided that they are designed and installed to prevent water from entering or accumulating within the components and to resist hydrostatic and hydrodynamic loads and stresses, including the effects of buoyancy, during the occurrence of flooding to the design flood elevation in compliance with the flood-resistant construction requirements of the Building Code of New York State.
Exception: Where the penetrating items are steel, ferrous or copper pipes, tubes or conduits, the annular space between the penetrating item and the fire-resistance-rated wall is permitted to be protected as follows:
Exception: Floor penetrations contained and located within the cavity of a wall do not require a T-rating.
Exception: This section shall not apply to the following appliances:
Exception: Where a code provision is less restrictive than the conditions of the listing of the equipment or appliance or the manufacturer’s installation instructions, the conditions of the listing and the manufacturer’s installation instructions shall apply.
Exception: This section shall not apply to appliance installations complying with Section 304.5.
Exception: The requirements of this section shall not apply where the appliances are protected from motor vehicle impact and installed in accordance with Section 304.3 and NFPA 30A.
Exception: The requirements of this section shall not apply where the appliances are protected from motor vehicle impact and installed in accordance with Section 304.3.
TABLE 305.4 PIPING SUPPORT SPACINGa
| MAXIMUM HORIZONTAL SPACING |
| MAXIMUM VERTICAL SPACING |
|Aluminum pipe and tubing||10||15|
|Brass tubing, 11/4-inch diameter and smaller||6||10|
|Brass tubing, 11/2-inch diameter and larger||10||10|
|Copper or copper-alloy pipe||12||10|
|Copper or copper-alloy tubing, 11/4-inch diameter and smaller||6||10|
|Copper or copper-alloy tubing, 11/2-inch diameter and larger||10||10|
|CPVC pipe or tubing, 1 inch and smaller||3||10c|
|CPVC pipe or tubing 11/4-inch and larger||4||10c|
|PB pipe or tubing||22/3||4|
|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.|
|a.||_top">See Section 301.15.|
|b.||The maximum horizontal spacing of cast-iron pipe hangers shall be increased to 10 feet where 10-foot lengths of pipe are installed.|
|c.||s uc_vertical_align_top"> Mid-story guide.|
Exception: This section shall not apply to replacement appliances installed in existing compartments and alcoves where the working space clearances are in accordance with the equipment or appliance manufacturer’s installation instructions.
Exception: Within a dwelling unit, appliances installed in a compartment, alcove, basement or similar space shall be accessed by an opening or door and an unobstructed passageway measuring not less than 24 inches (610 mm) wide and large enough to allow removal of the largest appliance in the space, provided that a level service space of not less than 30 inches (762 mm) deep and the height of the appliance, but not less than 30 inches (762 mm), is present at the front or service side of the appliance with the door open.
Permanent ladders installed to provide the required access shall comply with the following minimum design criteria:
Exception: Fuel-fired appliances that automatically shut down operation in the event of a stoppage in the condensate drainage system.
TABLE 308.6 CLEARANCE REDUCTION METHODS
TYPE OF PROTECTIVE ASSEMBLYa
REDUCED CLEARANCE WITH PROTECTION (inches)a
|Horizontal combustible assemblies located above the heat source||Horizontal combustible assemblies located beneath the heat source and all vertical combustible assemblies|
|Required clearance to combustibles without protection (inches)a||Required clearance to combustibles without protection (inches)a|
| Galvanized sheet metal, minimum nominal thickness of 0.024 inch (No. 24 Gage), mounted on 1-inch |
glass fiber or mineral wool batt reinforced with wire
on the back, 1 inch off the combustible assembly
| Galvanized sheet metal, minimum nominal thickness |
of 0.024 inch (No. 24 Gage), spaced 1 inch off the combustible assembly
| Two layers of galvanized sheet metal, minimum |
nominal thickness of 0.024 inch (No. 24 Gage), hav-ing a 1-inch airspace between layers, spaced 1 inch off the combustible assembly
|Two layers of galvanized sheet metal, minimum nominal thickness of 0.024 inch (No. 24 Gage), hav-ing 1 inch of fiberglass insulation between layers, spaced 1 inch off the combustible assembly||18||9||5||3||12||6||3||3|
|0.5-inch inorganic insulating board, over 1 inch of fiberglass or mineral wool batt, against the combustible assembly||24||12||6||4||18||9||5||3|
|3.5-inch brick wall, spaced 1 inch off the combustible wall||—||—||—||—||12||6||6||6|
|3.5-inch brick wall, against the combustible wall||—||—||—||—||24||12||6||5|
|For SI: 1 inch = 25.4 mm, °C = [(°F)-32]/1.8, 1 pound per cubic foot = 16.02 kg/m3, 1.0 Btu • in/ft2 • h • °F = 0.144 W/m2 • K.|
|a.||Mineral wool and glass fiber batts (blanket or board) shall have a minimum density of 8 pounds per cubic foot and a minimum melting point of 1,500°F. Insulation material utilized as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu • in./(ft2 • h • °F) or less. Insulation board shall be formed of noncombustible material.|
Exception: Interior spaces where the primary purpose is not associated with human comfort.