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The Outlet airduct and Inlet airduct must have f ree area ofnot l ess t han 1square
inch per 4 000 B TUH based onthe total input rating o fallappliances
inthe space.
The total free area orthe ventilation
louvers must have a free area ofnot l ess t han 1
square inch per 5 000 B TUH based onthe total input rating o fallappliances
inthe
space.
Fig.
8 = Combustion
Air Taken
From
Outdoors
Through
Vertical
Ducts
(without
louvers
in foundation)
....... Chimney
A06463
Ventilation
louvers
for
unheated
crawlspace
The Outlet air duct and Inlet air duct must have a free area of not less than 1 square
inch per 4000 BTUH based on the total input rating of all appliances
in the space.
The total free area or the ventilation
louvers
must have a free area of not less than 1
square
inch per 5000 BTUH
based on the total input rating of all applinaces
in the
space.
Fig. 9 - ('ombustion
Air Taken
From
Outdoors
Through
Vertical
Ducts
(with crawlspace
louvers)
A06464
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