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Can you vent an exhaust fan in a basement bathroom out the sidewall rather than the ceiling? If I vent it through the ceiling I would have to cut through 3 joists to vent my exhaust fan outside and tie it into an existing clothes dryer vent.

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  • Hello, and welcome to Home Improvement. How would you get the air to the sidewall; through the eaves? May 6, 2020 at 15:23
  • Will the fan itself be mounted in the wall, or just the exhaust vent?
    – isherwood
    May 6, 2020 at 17:50

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Yes you can mount the fan on the wall. if the wall exhausts to the outside it would be no different than a wall mount exhaust vent in the main floor bathroom. You cannot mount it on an internal wall and just dump the air into a stud bay (I have seen this tried and failed).

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You can not

tie it into an existing clothes dryer vent.

"The reasons being that you can't easily prevent backflow and you increase fire spread risk". ( Isherwood ).

Do your joist bays not run to an exterior wall ? ( there are specific restrictions on how big a hole you can put in a joist. )

You can mount a made for a ceiling fan and route the duct to and through an exterior wall.

You can mount a made for a wall fan on an exterior wall.

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