7. Water Condensation
The condensation of water in a dryer exhaust system is caused by the moisture in the
exhausted air contacting the cold inner surfaces of the ductwork. Condensation, which
forms at the beginning of the drying cycle, will dissipate quickly after the ductwork
becomes heated. However, if the ductwork passes through an area, which keeps it cool
throughout the drying cycle, considerable condensation can be expected. This can result
in a rapid accumulation of lint in the ductwork.
Ductwork, which runs through an unheated area or which is situated adjacent to an air
conditioning duct should be insulated to avoid such condensation problems. All joints
should be tight to avoid leaks and, where feasible, the duct should be sloped at least 1/8”
per foot (10 mm per meter) towards outdoors.
8. Accessibility for cleaning
Since it may be necessary from time to time to remove lint from the inside of the
ductwork, it is important that the exhaust system be installed with a provision for periodic
inspection and cleaning. Some provision should be made for access to turns and straight
runs of duct installed in an enclosed area, such as above plastered ceilings. Special
consideration should be given to the amount of maintenance required for roof caps on
vertical installations, since the user cannot be expected to make frequent inspections or
cleanings.
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