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Under-slab dryer vent

Discussion in 'Residential Mechanical Codes' started by kyhowey, Jul 26, 2012.

  1. Rider Rick

    Rider Rick Silver Member

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    Well Thank You Greg,

    I had no idea that the dryer vent plastic/vinyl flex duct are not to code and were a fire danger.
     
  2. Francis Vineyard

    Francis Vineyard Sawhorse

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    #22 Francis Vineyard, Jul 26, 2012
    Last edited by a moderator: Jul 27, 2012
  3. Francis Vineyard

    Francis Vineyard Sawhorse

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    RR I presume what you're seeing is the "flexible air connector" that is advertised as fire resistant UL 181 on the same shelf next to the dryer transition ducts. This is a common mistake made with air ducts and dryer ducts and I do wonder sometimes if it's done for the vender's convenience or a product marketing strategy to group the flexible ducts together in one place.

    Francis
     
  4. Rider Rick

    Rider Rick Silver Member

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    Francis,

    I'm going to stop by Home Depot and take a better look but I didn't know there were two difference ones.

    I'm sure the air ducts are less money and I'll bet some people are hooking them to there dryers without knowing.

    Rick
     
  5. Gregg Harris

    Gregg Harris Gold Member

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    Thank you Francis

    I guess I was not the only one with the idea. Although I disagree with the action
    statements for denial Ad I will run tests on both gas and electric. There is always 2015
     
  6. Rider Rick

    Rider Rick Silver Member

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    I went to Home Depot and you can't buy any plastic/vinyl flex ducting the dryer vent flex duct is rated at 450 degrees but the end of the line hood on the out side of the wall does have a screen.
     
  7. Francis Vineyard

    Francis Vineyard Sawhorse

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    How would you know the difference between flex dryer and air connector installed on the job?

    [​IMG]

    [​IMG]

    [​IMG]

    Francis
     
  8. Gregg Harris

    Gregg Harris Gold Member

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    Instead of having the UL 181 label it should have UL 2158 A label on the package. I am going to check a couple of suppliers in the next couple of days. The one I am using on my dryer does not have labeling on the ducting itself. I am trying to find someone with a gas dryer to run temperature tests on to compare them with my electric.

    Home Depot has on there web that the ones they supply are rated for electric but not gas. I am contacting MFG's to see if I can get more info.
     
  9. Doug Ables

    Doug Ables New Member

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    Codes state metal. As a dryer vent cleaner in the slab PVC vents are a terror to clean. The PVC creates static electricity as air moves over it, making lint stick to it more readily thereby creating a hazardous situation quickly. We rarely clean a slab vent that we do not get 5-10 gallons or more of lint out of it.
    Also the vents, due to their configuration create a trough for water to collect in. A normal load of clothes drying creates over a gallon of water in condensate. That water must be expelled from the vent. A slab vent will collect it until it has to be suctioned out. I have removed 17 gallons of water in one vent after a couple years use. The vents ruin the equipment that is made to clean dryer vents due to the 4-90 degree turns. Builders who install these useless vents should be made to clean them and see how much of a pain they are to us and the homeowner when we tell them they need to be rerouted. Also your comment about why are the plastic ducts sold at home depot if they are not meant to be used as a dryer vent. The answer is this....plastic vents are ok for air vents such as bathroom exhaust fans but not dryer vents. The only reason they are in the dryer vent area is the workers at HD and Lowes do not know any better. They are the same size and vents-so why not? When you add heat to plastic it becomes brittle and develops a hole. I have a picture of such an occurrence but don't know how to post it. But common sense tells me heat and thin plastic do not go together.
     
    fatboy, tmurray, ICE and 1 other person like this.
  10. Paul Sweet

    Paul Sweet Sawhorse

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    Big boxes sell lots of stuff that doesn't meet code.
     
    tmurray likes this.
  11. Francis Vineyard

    Francis Vineyard Sawhorse

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    Mr. Doug Ables, welcome to the forum and thanks for the additional information and sharing your experience.
     
  12. north star

    north star Sawhorse

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    $ : $ : $


    Doug Ables,

    Also, ...Welcome to The Building Codes Forum !

    To be able to post pictures \ images on to this Forum,
    one would need to become a Paid Subscription
    Sawhorse !........I am encouraging you and others
    to join and become Sawhorses.

    FWIW, ...the term Sawhorse was selected by the
    Forum owner and accepted by the membership.....It
    is a definition that; IMO, ...seems appropriate and fits
    very well. :D


    $ : $ : $
     
  13. fatboy

    fatboy Administrator

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    Welcome to the forum, and way to come out swinging with a great post!
     

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