Bathroom vent, were is the flapper valve?

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MrSmith728

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My master-bath bathroom vent must be stuck open because during the winter cold air streams down and makes the bathroom very cold. This doesn't happen in the guest-bath which seems to be working properly.

It's one of those vents with an electric fan in the ceiling and a simple pipe coming out of the roof.

Where would the flapper valve/vent be on this thing? At the bottom where the electric fan is or on the roof?
 
Usually right at the unit where the exhaust pipe attaches to the unit.
 
They are generally at the outlet of the fan an should be accessible by removing the grate and/or the fan motor.
 
this is the location of the ''flapper' damper
it can be reached by removing the grill and the fan motor
no big deal, 4 screws. and unplug a wire

Bathroom-exhaust-fan-ventilation-fan-exhaust-fan-kitchen-exhaust-fume-extractor-fan-15E.jpg
 
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