Bathroom vent

Have electric entractor fan in ceiling with venting outside but attached to overhang not on wall.
Keep getting backdraft but any flaps are for wall mounted vents. Any other way to stop backdraft.

 

fit a back draft shutter in the ducting tube

 

One of these

 

Thank you this is what I need

 

Except they don't work very well. You may need to go for an Icon 15 which has a built in shutter.

 

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