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During the recent one year, I have noticed my dryer is producing condensation and wet inside when it is not in use. I live in a 5 units apartment building and I am on the top floor. After I cleaned the dryer duct, it still has this problem. I almost feel the hot air comes from my neighbors' apartment and somehow it gets into my dyer when they are laundering.

Maybe the fan getting hot air out of the building for the building common duct is not working? How to identify? What type of contractors should I hire to check this issue?

Any advice is appreciated!

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  • Do the dryers all connect to a common exhaust shaft, or do they vent to individual terminations in the wall?
    – ThreePhaseEel
    May 30, 2020 at 14:57
  • Yeah, this sure sounds like the sort of thing you could get as the top connection to a shared vent.
    – Ecnerwal
    May 30, 2020 at 15:46
  • Thanks for your response. I just spoke with someone and was suggested to install a piece in the duct that I can manually open and shut the duct. When I do laundry, leave it open and shut it off once it is done. That will prevent the hot air from other apartment to come into my duct.
    – Carrie
    May 30, 2020 at 21:45
  • @Carrie -- IMC 504.11 point 2 prohibits dampers in dryer vent ducts in multidryer installations
    – ThreePhaseEel
    May 31, 2020 at 17:45
  • @ThreePhaseEel -- can you please let me know what does that mean? Thanks again
    – Carrie
    Jun 10, 2020 at 23:56

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