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When duct is horizontal it must be
laid to slope away at at least 1/8 inch
per foot. This is to ensure that
condensate cannot drain back into
the appliance.
If the exhaust duct is to be routed
through rooms, ceiling space etc., the
temperatures in these different areas
may differ greatly, which means that
the problem of condensation will
need to be addressed. The exhaust
duct will need to be insulated.
Installation of a non-return flap in the
exhaust duct is recommended. It
ensures that air, once ducted to the
outside, cannot get back into the
room again.
Air venting
35
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