Takagi AT-KJr3U-IN Installation Manual And Owner's Manual page 18

Combustion Air Supply Options
Confined
Space
Alternate
Air Inlet
1 in per
2
4,000 btu/h
Figure 1 - Direct to outdoors openings
Confined
Space
12" 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 per
2
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 per
2
4,000 btu/h
Inlet air duct
1 in per
2
4,000 btu/h
Alternative
Opening
Location
1 in per
2
3,000 btu/h
18
12" maximum
Two permanent
Openings
1 in per
2
4,000 btu/h
12" maximum
Figure 2 - Direct to outdoors openings
Two permanent openings
Confined
Space
Figure 4 - Horizontal duct openings
12" maximum
Confined
Space
Two permanent
Openings
12" maximum
Figure 6 - Two permanent openings
Page
Confined
Space
1 in per
2
2,000 btu/h
Outlet
Outdoor
Air Ducts
Inlet
1 in per
2
2,000 btu/h
1 in per
2
1,000 btu/h