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Combustion air supply options
Confined
Space
Alternate
Air Inlet
1 in
(6.5 cm
)
2
2
per 4,000 btu/h
Figure 1 - Direct to outdoors openings
Confined
Space
12" (305 mm)
maximum
Figure 3 - Vertical duct openings
Confined
Space
Figure 5 - SIngle opening
Gable vent
to outdoors
Install above
insulation
Outlet air to
attic 1 in
(6.5 cm
)
2
2
per 4,000 btu/h
Inlet air from
the crawl space
Open foundation vent
Gable vent
to outdoors
Install above
insulation
Outlet air to
attic 1 in
2
(6.5 cm
2
)
per 4,000 btu/h
Inlet air duct
1 in
(6.5 cm
)
2
2
per 4,000 btu/h
Alternative
Opening
Location
1 in
(6.5 cm
)
2
2
per 3,000 btu/h
18
Installation Manual
12" (305 mm)
maximum
Two permanent
Openings
Confined
1 in
(6.5 cm
)
Space
2
2
per 4,000 btu/h
12" (305 mm)
maximum
Figure 2 - Direct to outdoors openings
Two permanent openings
1 in
per 2,000 btu/h
Confined
Space
1 in
(6.5 cm
2
per 2,000 btu/h
Figure 4 - Horizontal duct openings
12" (305 mm)
maximum
Confined
Space
Two permanent
Openings
12" (305 mm)
maximum
Figure 6 - Two permanent openings
Page
Installation
(6.5 cm
)
2
2
Outlet
Outdoor
Air Ducts
Inlet
)
2
1 in
per
2
1,000 btu/h
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