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Community and Q&A

Was this bath exhaust tubing properly installed?

CaliforniaDan | Posted in Green Building Techniques on

My new house is under construction, and this is how the contractor installed the tubing from my bath exhaust. 
Will the bath exhaust work properly with all of the extra flexible tubing? It seems like the tubing should be cut shorter to reduce the run to the roof. Should I use rigid PVC for the exhaust?

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  1. Expert Member
    Akos | | #1

    Semi rigid aluminum work very well, with smooth bends is just a bit more restrictive than rigid duct. Could be a bit neater but that is about it.

    The item to watch is that the pipe in the attic is insulated and the jacket around the insulation is well sealed. Also make sure that it connects to a proper roof exhaust cap, not just points at a roof/gable vent as is typically done.

  2. CaliforniaDan | | #2

    Thank you for the helpful suggestions, Akos.

  3. Expert Member
    BILL WICHERS | | #3

    I would try to straighten that up. You'll get better airflow by keeping the run as straight as possible and minimizing the number of bends (especially SHARP bends).

    If this were my house, I'd try to get that done with rigid ducting too while everything is open. Code is OK either way, but rigid duct gets better airflow. With a short run like this though, if you just tidy it up to make it straighter and less crazy-straw like, it'll be fine.


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