Goodman Mfg GAS-FIRED WARM AIR FURNACE, MH95/ACSH96/AMEH96/ GCH95/GME95/GCH9 See 5.3.3-a

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

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 Inside Building.
	Equipment Located in Confined Spaces; All Air from Outdoors
See 5.3.3-a.
(b) All Air from Outdoors: The confined space shall be provided with					Through Ventilated Attic. See 5.3.3-b.
		3. When communicating with the outdoors through horizontal ducts,
two permanent openings, one commencing within 12 inches of the
top and one commencing within 12 inches of the bottom of the			each opening shall have a minimum free area of 1 square inch per
enclosure. The openings shall communicate directly, or by ducts,			2,000 BTU per hour of total input rating of all equipment in the
with the outdoors or spaces (crawl or attic) that freely communicate			enclosure.
with the outdoors.				Chimney or Gas Vent

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.						NOTE: The air duct openings
						must have a free area of not
	Chimney or Gas Vent					less than one square inch per
		Ventilation louvers				2000 BTU of the total input
						rating of all equipment in the
		(each end of attic)			Outlet air duct	enclosure*.
		NOTE: The inlet and outlet air
		openings must each have a free
		area of not less than one square		Water
		inch per 4000 BTU of the		Heater
			Furnace
		total input rating of all equipment
		in the enclosure.			Inlet air duct

Outlet Air

Water

		Heater		*If the appliance room is located against an outside wall and the air openings communicate directly with the
	Furnace		Inlet Air
				outdoors, each opening shall have a free area of not less than one square inch per 4,000 BTU per hour of
Alternate				the total input rating of all appliances in the enclosure.
				Equipment Located in Confined Spaces; All Air from Outdoors.
air inlet
				See 5.3.3-b.

Ventilation louvers for unheated crawl space

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.

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

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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