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PVC Venting / Power Vent Water Heater

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Hello, checking out the ASTM standards for venting a power vent water heater. I would like to use long radius 90 deg elbows. Problem is I can only find Schedule DWV or ASTM D 1784. This is non pressure application. The temperature range is 140, same as a Schedule 40. Manufactures call for ASTM D 1785. I can not find a fitting that meets that. If I look at Muller Industries their DWV fitting meet ASTM-D2665. Any one ever run into this ? Thanks!
Gene
Gene in Northern NJ
NJ HVACR License 19HC00537600

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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,629
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    I could of course be wrong but my understanding is that "IPEX" is the only brand of PVC that is "listed & approved" for venting. Don't know if they have approved long radius 90s
  • JUGHNE
    JUGHNE Member Posts: 11,077
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    When I feel the need for less restrictive flow I use 2 45 ells with some length between. Even a street 45 glued directly into a standard 45 will give you more radius.

    I used to do the same thing for DWV to avoid sharp turns especially on the horizontal run.
  • Henry
    Henry Member Posts: 998
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    Ipex S636 PVC is the same except for colour and labelling as SCH 40 PVC. There are only two makers of S636 PVC so they can charge more than SCH 40 PVC! Use two 45s instead of an elbow.
    JUGHNE
  • Bug512
    Bug512 Member Posts: 52
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    Thanks for the info. The two 45's make a lot of sense.
    Gene in Northern NJ
    NJ HVACR License 19HC00537600