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Thread: Inline heat/AC duct fans

  1. #1
    Engineer garyl53's Avatar
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    Dec 2006
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    Default Inline heat/AC duct fans

    Hi,
    I have an upstairs bedroom that I want to improve the AC flow. Do inline duct fans help? Is it better to put a fan on the return line or the vent into the room?
    Thanks,
    Gary

  2. #2
    Engineer garyl53's Avatar
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    Default

    Anyone with any experience?
    Gary

  3. #3
    DIY scratch-pad engineer leejosepho's Avatar
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    Default

    I have two relatively inexpensive 6" fans in my heating ducts. They are noisy in both the feed and return lines, with the sound telegraphing over and through the entire length of the steel duct. I have read about in-line blowers -- wheels rather than blades, I believe -- being much better, but they also cost quite a bit more. Also, I read somewhere that soft ducts do not telegraph as much.

    If you do a web search for "duct fan" or "duct blower", you will find a lot of info and types available.

  4. #4
    Homeowner geniescience's Avatar
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    Nov 2005
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    Default

    squirrel cage fans make less noise than blade fans. They also cost more.

    david

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