Venting bath fan through floor joists. PVC best option for vent?

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Old 01-21-18, 06:51 PM
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Venting bath fan through floor joists. PVC best option for vent?

I am putting in a bathroom in my basement and trying to run the vent to the fan. I am concerned about not having access to the vent duct in the floor joist if something were to come apart or rip.

I am considering running 4" PVC from the fan to the wall with a 90-degree elbow where I will attach a semi-rigid vent duct and carry it out to the vent in the wall. The reason for this is, by means of pulling out a recessed shelf I will have access through the wall if I have to fix the vent for any reason but the 90 degrees will be so tight I would not be able to snake a new duct through to the joist.

Is this the best way to go?? Any suggestions or ideas are appreciated.


PS: Also, should the duct be insulated in any way to avoid condensation or will that not be an issue where the temp shouldnt be much different between the joists?
 
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Old 01-21-18, 07:02 PM
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You could but it would be better to use rigid duct. If pvc works best with your fan, it might make the most sense.
 

Last edited by XSleeper; 01-21-18 at 07:17 PM.
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Old 01-21-18, 08:00 PM
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With the rigid duct would I need solid seem duct or would the stuff that clips together work without letting moisture into the floor joists?
 
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Old 01-21-18, 08:10 PM
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You can use the snap together duct. You aren't going to get any condensation in the ceiling because you are using a 90 and venting below.
 
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Old 01-21-18, 08:31 PM
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Thanks pjmax. One more question. Can I use the swivel duct elbows in a 90 or should I get a solid 90?
 
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Old 01-21-18, 08:33 PM
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The swivel type is fine for there.
 
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