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Quieting a loud bath exhaust fan.

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New bathrrom with remote fan. Two ceiling vents Y into the remote fan input about 15 feet away, then out the side of the building it goes. Similar install at another location is whisper quiet. This install … very loud. The difference? The quiet one is flex ducted, the loud one is hard piped. Ceilings are closed. Do I have any options to quiet the roar?

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  • Dave Carpentier
    Dave Carpentier Member Posts: 606
    edited September 2023
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    Presumably there is access to the inline fan ? Could maybe play around there to figure out which of the 3 pipes is making a harmonic or if it's the fan itself (vibrating) ?
    30+ yrs in telecom outside plant.
    Currently in building maintenance.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,849
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    Maybe putting in a damper and closing it slightly would help
  • woobagooba
    woobagooba Member Posts: 186
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    Here is my access. You can barely see the two 4" pipes coming into the fan, then the 6" pipe to the outside.


  • Dave Carpentier
    Dave Carpentier Member Posts: 606
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    Looks like a treat to service lol. Looks like you cant get to the input side at all.
    Is it an air rushing/swooshing sound ? Whistle ? Howl ? Low pitched hum ?
    Can the fan speed be changed ?
    30+ yrs in telecom outside plant.
    Currently in building maintenance.
  • woobagooba
    woobagooba Member Posts: 186
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    Loud low frequency whooshing sound. I will check the fan speed detail.