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Common Fan Assisted Dryer Exhaust Stack
(Auxiliary Roof Fan Systems)
The stack outlet (see Illustration No.2) must be fitted to a continuous duty exhaust fan
rated to handle the stack air volume for the total number of dryers on the system. Periodic
cleaning of the exhaust fan is necessary to maintain efficient operation.
The bottom of the stack should contain a barometric damper to prevent drawing air
through the dryers not in use, and a lint cleanout access door. The damper should be
adjusted to just open with all dryers on and the continuous duty exhaust fan operating.
The weighted damper in the individual dryer ducts should be adjusted so that it will just
close with all dryers off and the continuous duty exhaust fan operating. The fan should be
running all the time.
The duct system from each individual dryer must meet the turn and length requirements
noted in Section 1.
The required stack diameter for air volumes of 200 CFM to 3000 CFM can be determined
from Illustration No.3 and calculations on Page 11.
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