Amana AMV9, ACV9 installation instructions Building. See 5.3.3-a

per hour of the total input rating of all gas utilization equipment in the confined space, but not less than 100 square inches. One open- ing shall be within 12 inches of the top and one within 12 inches of the bottom of the enclosure.

Chimney or Gas Vent

NOTE: Each opening must have a free area of not less than one square inch per 1000 BTU of the total input rating of all equip- ment in the enclosure, but not less than 100 square inches.

Opening

Water

Furnace Heater

Opening

Equipment Located in Confined Spaces; All Air from Inside

Building. See 5.3.3-a.

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 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.

(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

Heater

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

Furnace

Inlet air duct

*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.

NOTE: The single opening must have

a free area of not less than one Chimney or Gas Vent square inch per 3000 BTU of

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.

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.

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