Goodman Mfg AMV8 Specially Engineered Installations, NOTE The single opening must have

(b)All Air from Outdoors: The confined space shall be provided with two permanent openings, one commencing within 12 inches of the top and one commencing within 12 inches of the bottom of the enclosure. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.

1.When directly communicating with the outdoors, each opening shall have a minimum free area of 1 square inch per 4,000 BTU per hour of total input rating of all equipment in the enclosure.

Chimney or Gas Vent

Outlet air duct

Water

Furnace Heater

Inlet air duct

NOTE: The air duct openings must have a free area of not less than one square inch per 2000 BTU of the total input rating of all equipment in the enclosure*.

Alternate air inlet

Chimney or Gas Vent

Ventilation louvers (each end of attic)

NOTE: The inlet and outlet air openings must each have a free area of not less than one square inch per 4000 BTU of the

total input rating of all equipment in the enclosure.

		Outlet Air
	Water
	Heater
Furnace		Inlet Air

Ventilation louvers for unheated crawl space

*If the appliance room is located against an outside wall and the air openings communicate directly with the outdoors, each opening shall have a free area of not less than one square inch per 4,000 BTU per hour of the total input rating of all appliances in the enclosure.

Equipment Located in Confined Spaces;

All Air from Outdoors. See 5.3.3-b.

4.When ducts are used, they shall be of the same cross- sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall not be less than 3 inches.

Equipment Located in Confined Spaces; All Air from Outdoors—Inlet Air from Ventilated Crawl Space and Outlet Air to Ventilated Attic.

See 5.3.3-b

2.When communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 BTU per hour of total input rating of all equipment in the enclosure.

Chimney or Gas Vent

Ventilation louvers (each end of attic)

NOTE: The inlet and outlet air openings must each have a free area of not less than one square inch per 4000 BTU of the

total input rating of all equipment in the enclosure.

		Outlet Air
	W ater
	Heater
Furnace		Inlet air duct
		[ends 1 ft (300 mm)
		above floor]

Equipment Located in Confined Spaces; All Air from Outdoors

Through Ventilated Attic. See 5.3.3-b.

3.When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 BTU per hour of total input rating of all equipment in the enclosure.

NOTE: The single opening must have	Chimney or Gas Vent
a free area of not less than one
square inch per 3000 BTU of
the total input rating of all equip-
ment in the enclosure, but not less than
the sum of the areas of all vent
connectors in the confined space.

		Opening
		Alternate
	Water
		Opening
	Heater
		Location
Furnace

Equipment Located in Confined Spaces; All Air from Outdoors -

Single Air Opening. See 5.3.3-b.

5.One permanent opening may be permitted, provided the equipment has clearances of at least 1” from the sides and back and 6” from the front. The opening shall communicate directly with the outdoors and must be located within 12” of the top of the enclosure. The minimum free area of the opening shall be 1 square inch per 3,000 BTU per hour of total input rating of all equipment in the enclosure. The minimum free area shall not be less than the sum of the areas of all vent connectors in the confined space.

5.3.4Specially Engineered Installations:

The requirements of 5.3.3 shall not necessarily govern when special engineering, approved by the authority having jurisdiction, provides an adequate supply of air for combustion, ventilation, and dilution of flue gases.

IO-247A 9 12/04