Short Duct Run to Bathroom Has Little to No Air Flow

Discussion in 'HVAC Heating & Cooling' started by kailor, Jun 7, 2011.

  1. kailor

    kailor Member

    Dec 2, 2010
    Huntsville, Alabama
    I have a 3' straight duct run from the main trunk in a mobile home to a bathroom. It just does not have any air moving throuh it! How can I vastly improve the air flow into the bathroom?

  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    You may need a deflector in the main to direct air there. Or, put a booster fan in the duct.
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  4. TheycallMeDave

    TheycallMeDave New Member

    Jul 9, 2011
    Retired HVAC Owner/Tech
    Northern Florida
    First, id make sure that tiny diameter duct isnt partially restricted with debris inside it (or partially crushed) ... then id run a larger diameter duct providing you have access to the main trunk duct where the branch duct is attached. You may want to run something fairly flexible thru the duct opening back to the main duct to make sure it is fully open without restriction.
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