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  1. #1
    Join Date
    Jul 2007

    Default Any issue with 45 elbow down on Cat IV vent termination

    My fear would be, potentially, frost closure on the vent. We typically on see straight terminations, vertical, or 90 to 90 outward and horizontal.

    This is 2012 Rheem 94% single stage, can't find on their site. Thanks

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    NHIE Practice Exam

  2. #2
    Join Date
    Feb 2008
    Chicago IL

    Default Re: Any issue with 45 elbow down on Cat IV vent termination

    I don't have an issue with a 45 on the end. I don't remember seeing a restriction for 45's in any install guides. I've found 90's ice over more. Fairly standard practice. Often times a 45 can work a bit better than a 90 or straight end in terms of directing discharge; especially in Chicago gangways.
    As far as finding the info on the Rheem site, probably not. Rheem and (others) have changed their sites from all encompassing to consumer feeds. Getting the technical data you want nowadays means registering on many sites.
    On the old Rheem site the install guide was a readily downloadable PDF, now you have to register to access lots of that type of info. The end termination specs are part of the install guide which comes with the furnace.
    Google the model # itself, sometimes the install guide will pop up using that.
    "The Code is not a ceiling to reach but a floor to work up from"

  3. #3
    Join Date
    Jul 2007

    Default Re: Any issue with 45 elbow down on Cat IV vent termination

    Following is from NORDYNE install manual

    vent termination can cause recirculation
    of the fl ue gases. This may
    result in furnace vibration. In severe
    cases, the furnace will cycle due to
    the intermittent contact between the
    fl ame and the fl ame sensor. If you
    note oscillations occurring, check the
    vent confi guration. Make sure that
    the exhaust vent does not have a 90
    degree termination.

    Vent Pipe Installation
    Pipe Routing and Support
    Route piping as directly as possible between
    the furnace and the outdoors and remember
    that routing affects pipe size requirements per
    the preceding section. If a two pipe system is
    used, locate the combustion air intake and the
    vent exhaust in the same atmospheric pressure
    zone - i.e. both must exit the building though the
    same portion of exterior wall or roof (See Figure
    22). Vent piping must be sloped upwards not
    less than 1/4 per foot in the direction from the
    furnace to the terminal. This is to ensure that
    any condensate fl ows back to the furnace (where
    it can be disposed of through the condensate
    disposal system).


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