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18-CE01D1-1F-EN
Special Case Venting
Special instructions for direct vent furnace air intake.
In certain applications, particularly when the furnace is located in a
basement, there are certain conditions that can be met where warm
humid air from the outside is drawn into combustion air piping. If the
area where the piping is located is conditioned below 70° F,
condensation could occur inside the piping and ultimately drain into
the furnace compartment, which could lead to premature component
failure.
We recommend following one of the options to prevent this condition
from occurring and possibly damaging components within the
furnace:
Note:
Inlet air piping is not considered to be part of the venting
system. The inlet air piping may be made from PVC.
Option 1
If possible, slope the inlet combustion air piping away from the
furnace. Condensation that may occur will now drain outside of the
home. The combustion air outlet piping must remain sloped back to
the furnace.
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Summary of Contents for S9V2B040D3PSBA
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