618.4 Prohibited sources.
FGC § 618.4
Outdoor or return air for forced-air heating or forced-air heating and cooling systems shall not be taken from the following locations: 1. Closer than 10 feet (3048 mm) from an appliance vent outlet, a vent opening from a plumbing drainage system or the discharge outlet of an exhaust fan, unless the outlet is 3 feet (914.4 mm) above the outside air inlet.
2.Where there is the presence of objectionable odors, fumes or flammable vapors; or where located less than 10 feet (3048 mm) above the surface of any abutting public way or driveway; or where located at grade level by a sidewalk, street, alley or driveway.
3.A hazardous or insanitary location or a refrigeration machinery room as defined in the New York City Mechanical Code.
4.A room or space, the volume of which is less than 25 percent of the entire volume served by such system. Where connected by a permanent opening having an area sized in accordance with Section 618.2, adjoining rooms or spaces shall be considered as a single room or space for the purpose of determining the volume of such rooms or spaces. Exception: The minimum volume requirement shall not apply where the amount of return air taken from a room or space is less than or equal to the amount of supply air delivered to such room or space.
5.A room or space containing an appliance where such a room or space serves as the sole source of return air. Exception: This shall not apply where: 1. The appliance is a direct-vent appliance or an appliance not requiring a vent in accordance with Section 501.8.
6.A closet, bathroom, toilet room, kitchen, garage, boiler room, furnace room or unconditioned attic. Exceptions: 1. Where return air intakes are located not less than 10 feet (3048 mm) from cooking appliances and serve only the kitchen area, taking return air from a kitchen area shall not be prohibited.
7.A crawl space by means of direct connection to the return side of a forced-air system. Transfer openings in the crawl space enclosure shall not be prohibited.
