20
Page
Combustion air supply options
X3™ CARTRIDGE NOT SHOWN FOR CLARITY.
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 from
the crawl space
Open foundation vent
Confined
Space
Alternate
Air Inlet
1 in
2
(6.5 cm
2
)
per 4,000 btu/h
Figure 1 - Direct to outdoors openings
Figure 3 - Vertical
duct openings
Outlet air to
attic 1 in
2
(6.5 cm
2
)
per 4,000 btu/h
Inlet air duct
1 in
2
(6.5 cm
2
)
per 4,000 btu/h
Confined
Space
12” (305 mm)
maximum
Gable vent
to outdoors
Install above
insulation
Figure 5 - Single opening
Confined
Space
1 in
2
(6.5 cm
2
)
per 3,000
btu/h
Alternative
Opening
Location
Figure 6 - Two permanent openings
Two permanent
Openings
1 in
2
(6.5 cm
2
)
per
1,000 btu/h
12” (305 mm)
maximum
12” (305 mm)
maximum
Confined
Space
Figure 4 - Horizontal duct openings
1 in
2
(6.5 cm
2
)
per 2,000 btu/h
Confined
Space
Outlet
Inlet
Outdoor
Air Ducts
1 in
2
(6.5 cm
2
)
per 2,000 btu/h
Figure 2 - Direct to outdoors openings
Two permanent openings
Two permanent
Openings
1 in
2
(6.5 cm
2
)
per 4,000 btu/h
12” (305 mm)
maximum
12” (305 mm)
maximum
Confined
Space
Installation
Installation Manual
Summary of Contents for 240HX3
Page 64: ...3PL009 2000599585 Rev B ...
