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Thread: Booster fan

  1. #1
    DIY Member
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    Default Booster fan

    We have a house with a bedroom over the garage. The house is well insulated. Furnace is a mid efficiency 10 years old , same as the house. The ducting is ill designed. We can remove the basement ceiling and redo some of the ducts but it is still a long run up to that bedroom. I am thinking of repalcing the furnave with a 94% efficiency DC fan motor unit. Would it be possible to install a booster fan in the large duct that feeds that bedroom?

    THanks

    Moisheh

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    First thing I'd try to to ensure all of the joints in the ducts are sealed so they don't leak. Then, if you don't have any dampers in the system, you might install them t oforce more air where you want by partially blocking off those areas that get plenty or too much. A new, higher efficiency furnace won't resolve your issue if you don't make any changes to the ductwork. Tighten it up, then see what happens.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Senior Member Hube's Avatar
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    I second the good advice given by Jadnashua.Try slightly dampering down a few of the rooms that have good air flow. Note the word "slightly". By doing this it will send more air flow to this problem room. When dampering down, make sure you mark the starting point of the dampers handle position so that you can put it back the same way just in case this method does'nt work out. (but I think it will)
    Also has this problem room have any RETURN air. Return in a room is just as important as the supply air. You can only put in as much supply air as there is return air coming out of it.

  4. #4
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    Thanks for the replies. Presently there are no dampers in the ducts. We are going to redo some of the duct work and try and run a more direct duct to the problem area. At the same time we will install dampers.

    Moisheh

  5. #5
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    Thanks for the replies. Presently there are no dampers in the ducts. We are going to redo some of the duct work and try and run a more direct duct to the problem area. At the same time we will install dampers.

    Moisheh

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