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  1. #1
    Mike Bossen's Avatar
    Mike Bossen Guest

    Default Code help for Dryer duct

    Found a dryer vent duct routed into bedroom closet then out to the exterior wall. This looks to be a DIY job and was such written up as improper installation and fire hazard. However, the buyer would like to get some code references to the proper installation. Any help is greatly appreciated.

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  2. #2
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    Default Re: Code help for Dryer duct

    I didn't see anything in the 2006 IRC clothes dryer section that would forbid this, unless the manufacturer does, for some reason.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  3. #3
    Mark Nahrgang's Avatar
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    Default Re: Code help for Dryer duct

    I don't see why it's a problem. It's a metal duct. I have a "standard" comment that I put in virtually every report to be sure to keep it clean. Other than it taking up closet space I'd not even mention it.


  4. #4
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    Default Re: Code help for Dryer duct

    What is the overall developed length of the pipe run? Is that a sheet metal screw I see in the piping at the bottom elbow? Are all of the joints sealed with an approved duct tape (bottom elbow again)? Have the pipe joints been made in the direction of flow?

    I can't really tell enough from the photo but any one of these could be a potential problem from a code/fire hazard perspective.

    Even outside of the code it would be fair to say that it is not a "standard and customary practice" to run a dryer vent through a clothes closet.


  5. #5
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    Default Re: Code help for Dryer duct

    badair http://www.adairinspection.com Garland, TX 75042 TREC # 4563
    Commercial-Residential-Construction-EIFS-Infrared Thermography
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  6. #6
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    Default Re: Code help for Dryer duct

    Nothing prohibits that, however, your client will want to protect that from physical damage by installing some type of protective chase around/over it.

    Code is minimum, not common sense.

    As others have stated, make sure the male end is inserted in the female end in the direction of flow - no ridges which may collect or catch lint are allowed. Neither are screws.

    Remove that "ducK" 'ducT' tape and use real "duct" tape on those joints before installing the chase over it.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
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  7. #7
    Mike Bossen's Avatar
    Mike Bossen Guest

    Default Re: Code help for Dryer duct

    Thanks for all of the input from everybody. All of the problems that were mentioned in the replys were addressed in the report and the buyer is planning on complete removal of this setup and re install in a more appropriate location. The buyer was just hoping to find some code references to help with negotiations but does not sound like the codes specifically address installation such as this. No matter, as it will be corrected regardless. Thanks again for the input.


  8. #8
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    Default Re: Code help for Dryer duct

    Mike,

    You will frequently find that code does not address stuff you find, because 'code' is only addressing *the minimum crappiest way one is legally allowed to do things*, no worse.

    'Building to code' just means the builder is building 'crap'.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  9. #9
    Richard Rushing's Avatar
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    Default Re: Code help for Dryer duct

    Quote Originally Posted by Jerry Peck View Post

    'Building to code' just means the builder is building 'crap'.
    Soooooo... when we have minimalist inspectors (SOB) it just means that they are inspecting like crap.

    Rich


  10. #10
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    Red face Re: Code help for Dryer duct

    I know it is an old post but the picture says a thousand words. The installation is incorrect of what i see. Duct Tape? Fire hazard bigtime! Please look at the 2009 International Mechanical Codes and the 2009 International Residential Building Codes when Inspecting. Nice Post!

    Chris Roth
    Dryer Vent Wizard
    Brownsburg, IN


  11. #11
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    Default Re: Code help for Dryer duct

    Quote Originally Posted by Chris Roth View Post
    I know it is an old post but the picture says a thousand words. The installation is incorrect of what i see. Duct Tape? Fire hazard bigtime! Please look at the 2009 International Mechanical Codes and the 2009 International Residential Building Codes when Inspecting. Nice Post!

    In looking at that photo again (and without re-reading the posts above it) I have to wonder where the dryer is:
    - a) is the dryer to the left?
    - b) is the dryer on the other side of that wall?

    It makes a BIG difference.

    Jerry Peck, Construction / Litigation Consultant
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    www.AskCodeMan.com

  12. #12
    chris mcintyre's Avatar
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    Default Re: Code help for Dryer duct

    Quote Originally Posted by Jerry Peck View Post
    It makes a BIG difference.
    Why?


  13. #13
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    Default Re: Code help for Dryer duct

    Quote Originally Posted by Jerry Peck View Post
    In looking at that photo again (and without re-reading the posts above it) I have to wonder where the dryer is:
    - a) is the dryer to the left?
    - b) is the dryer on the other side of that wall?

    It makes a BIG difference.
    Quote Originally Posted by chris mcintyre View Post
    Why?
    The direction of flow of air and the direction of the fittings.

    The air must flow with the fittings so there are no facing ledges or edges to trap lint as there would be with the direction of the flow against the fittings.

    - M1502.5 Duct construction. Exhaust ducts shall be constructed of minimum 0.016-inch-thick (0.4 mm) rigid metal ducts, having smooth interior surfaces with joints running in the direction of air flow. Exhaust ducts shall not be connected with sheet-metal screws or fastening means which extend into the duct.


    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  14. #14
    chris mcintyre's Avatar
    chris mcintyre Guest

    Default Re: Code help for Dryer duct

    Quote Originally Posted by Jerry Peck View Post
    The direction of flow of air and the direction of the fittings.

    The air must flow with the fittings so there are no facing ledges or edges to trap lint as there would be with the direction of the flow against the fittings.

    - M1502.5 Duct construction. Exhaust ducts shall be constructed of minimum 0.016-inch-thick (0.4 mm) rigid metal ducts, having smooth interior surfaces with joints running in the direction of air flow. Exhaust ducts shall not be connected with sheet-metal screws or fastening means which extend into the duct.
    OK, got it, wasn't think about the fittings, I thought it might have something to do with the pipe up the wall.


  15. #15
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    Cool Re: Code help for Dryer duct

    I still have a problem with the information from that site where it shows you how to damage and deform flexible transition duct for dryer venting. First of all, as soon as you crush the corrugations, this duct tends to unlock its seams and come apart. It also crushes any warranty and listing. BTW, transition duct must be listed to UL2158A, which most are not. You would have to get clear written permission from the mfr. that their duct is approved for ovalizing, by what means, up to what aspect/ ratio and how to attach it. Most importantly of all, to date, nobody has shown me how to attach a flexible transition duct without violating the male end downstream requirement. Also, when you ovalize a duct, you reduce the flow capacity. Corrugated ducts themselves reduce flow capacity about 20% over smoothwalled duct when round but routed straight. If you make a lot of bends in flex snaking around, you reduce flow capacity even further. FYI, you would need to ovalize a 5" round duct into a 4" minimum dimension just to equal the cross-sectional area of a 4" round. If they ovalize to 3.5" for a stud cavity, that 5" ovalized is right at the limit. BTW, you may need strike protection for ducts in wall cavities.

    Now, if someone could come up with a listed transition for flex that maintained a male end downstream, then I'd say you have a code compliant product. Until then, I don't see how any flex is legal.

    BTW, where's the support for that rigid duct in the original pic and where's the sealing per the energy code/ weatherization requirements?

    Keep the fire in the fireplace.

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