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Bath fan - size matters

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This windowless hall bath had the original exhaust fan removed and replaced with:


1. How would you vent this directly to the exterior?

2. If you run the fan with the door shut for privacy, will it suck the water out of the traps?

3. Should the owner change his diet, or seek medical attention?

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When I run into this set-up, I set a tissue on the sink and bath tub drains, and then operate the fan with the door to the bathroom closed. Close the toilet seat lid. (You should not stay in the bathroom when you do this.) It will give you a pretty good idea as to whether the traps will be affected.

Check the archives, I'm pretty sure this has been covered.

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