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  1. #1
    Join Date
    Jan 2008
    Posts
    1

    Default length of a dryer vent

    I want to replace my flexible aluminium dryer vent hose with a rigid metal vent hose. how many right angle turns are you allowed? I need to cover a distance of 10 feet and i have 4 right angle turns (2 right turns, 1 turn going vertical and the last turn o go back to horizontal). i can't move the dryer to get it closer to the vent because of the gas pipe.

  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: length of a dryer vent

    Good to hear you are using the rigid ducting.

    Every 90 degree elbow adds restriction approx. 4-5 feet of equivalent length to the duct. So in theory that would add approx. 16-20 feet of ducting to the 10 feet you have to go equaling around 26-30 of equivalent distance.... which is around the maximum from a dryer.

    If you can make the elbows less than 90 degrees it will help reduce the restrictions.

    Hope this helps.

  3. #3
    Join Date
    Oct 2007
    Location
    Cedarburg, WI
    Posts
    0

    Default Re: length of a dryer vent

    You can make the last two elbows into 45s with a lenth between them. also don't forget to factor in the first 90 out the rear of the dryer.

  4. #4
    Join Date
    Jan 2010
    Posts
    163

    Default Re: length of a dryer vent

    Codewise, the limit is 25 equivalent feet, meaning that you add the measured length to the fitting equivalants. So, on a measured length of 10 feet, you could have 3 90 degree elbows on the vent.

    However, the code also adds that, if the dryer manufacturer's installation instructions allow longer lengths and more elbows, you can go with that.

    Nearly every manufacturer would allow the setup you have, and even more. But check your installation manual to be sure.

  5. #5
    Join Date
    Mar 2009
    Posts
    1,387

    Default Re: length of a dryer vent

    Great time to consider adding a secondary lint trap into the exhaust duct . Really helpful in long pipe runs to stop build up of lint and reducing fire potential...

  6. #6
    Join Date
    Apr 2011
    Posts
    11

    Default Re: length of a dryer vent

    Does anyone know what the code is on this? It seems that I always am getting in trouble for this and can NEVER get enough info on it

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