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Unread 06-21-2010, 08:08 PM   #22
CBQ
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Quote:
Originally Posted by BruceKWHP View Post
I was reading about one of the fans (for a Stoker I think) that had a plastic fan blades and a flap door to protect it. The flap door swings open with airflow.
The flap door is there to cut off any natural draft that might occur when the fan is shut down.
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