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Thread: Hooking up two bathroom fans to one vent

  1. #1
    DIY Junior Member Jwhitman's Avatar
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    Default Hooking up two bathroom fans to one vent

    I have a single exhaust fan connected to a 4" duct to a outside vent. I would like to install another fan in a bathroom next to it. I figured just a Y and backdrafts should take care of it, but all the Y's I can find are crimped to flow in the wrong direction. Is there a solution? Any help appreciated.
    Thanks,
    J

  2. #2
    Plumber jimbo's Avatar
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    At any hardware store, you can buy the tool to put those crips on the end of a tube or fitting.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    A higher tech solution would be to use one fan designed to vent multiple rooms such as some of the stuff from Fantec. They have the advantage that the fan motor is remote from the rooms, so it is very quiet.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Two fans into one duct are never a good idea, but I cannot visualize HOW you are planning to install the "Y" if you think the crimps are backwards, because the only correct way to install it would be in the direction the crimps are flowing. If they were "backwards" then the "Y" would be taking ONE source, such as a furnace or fan, and diverting it into TWO ducts, which is the opposite of any logical installation. Unless you existing pipe is ALL backwards with the crimps pointing to the fan instead of away from it.

  5. #5
    Retired prof. engr. gator37's Avatar
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    Look at you fans. If they are ceiling fans they probably already have a backdraft damp on them.

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