Hooking up two bathroom fans to one vent

Discussion in 'HVAC Heating & Cooling' started by Jwhitman, Apr 7, 2010.

  1. Jwhitman

    Jwhitman New Member

    Messages:
    20
    Location:
    California
    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. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    At any hardware store, you can buy the tool to put those crips on the end of a tube or fitting.
  3. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,817
    Location:
    New England
    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.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,279
    Location:
    Cave Creek, Arizona
    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. gator37

    gator37 Retired prof. engr.

    Messages:
    108
    Location:
    Alabama
    Look at you fans. If they are ceiling fans they probably already have a backdraft damp on them.
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