Bath Fan with incorrect Vent size

Old 09-02-23, 01:24 PM
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Bath Fan with incorrect Vent size

My Bath Fan has died, Checked power and its all good. Went and bought a nice new one. It has a 4 inch vent in the side, pretty standard I think, as I have replaced Bath Fans many times before. But when I removed my old bath fan, I found that it had a 6 inch Exhaust facing straight up and out the roof (Roof is about 1 foot above ceiling in that spot). What do I do about this? Can I just get a short 4 inch piece and try to aim it over to the inside of the 6 inch and use some tape to keep it there? Will it matter if it is sealed, since the hot air is going to rise anyway? Thanks!
Old 09-02-23, 01:43 PM
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Welcome to the forums.

Unusual to have a 6" vent line for a bath exhaust.
Possibly it was originally used for a kitchen exhaust.

You be best to get a 6" to 4" duct reducer.

Mike Paulus voted this post useful.

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