Goodman GMV8 Installation & Operating Instructions Manual page 9

directly with an additional room(s) of sufficient volume so
that the combined volume of all spaces meets the criteria
for an unconfined space. The total input of all gas utilization
equipment installed in the combined space shall be
considered in making this determination. Each opening shall
have a minimum free area of 1 square inch per 1,000 BTU
per hour of the total input rating of all gas utilization
equipment in the confined space, but not less than 100
square inches. One opening shall be within 12 inches of the
top and one within 12 inches of the bottom of the enclosure.
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.
Equipment Located in Confined Spaces;
All Air from Inside Building. See 5.3.3-a.
(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
Water
Heater
Furnace
Alternate
air inlet
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.
Chimney or Gas Vent
Water
Heater
Furnace
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
Inlet Air
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
Fu rnace
Opening
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
Opening
1 square inch per 2,000 BTU per hour of total input rating
of all equipment in the enclosure.
Chimney or Gas Vent
Furnace
Equipment Located in Confined Spaces;
All Air from Outdoors. See 5.3.3-b.
*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.
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.
9
Ventilation lou vers
(ea ch end of attic)
N OTE: The inlet and outlet a ir
openings must each have a free
area of not less than one square
inch per 4000 B TU of the
total input rating of all equipment
in the e nclosure.
Outlet Air
W ater
Heater
Inlet a ir duct
[end s 1 ft (3 00 mm )
abo ve floor]
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*.
Outlet air duct
Water
Heater
Inlet air duct