Type 'B' Vent?
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Thread: Type 'B' Vent?

  1. #1
    Join Date
    Jun 2008
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    Type 'B' Vent?

    I'm trying to determine if this attic vent installation (photo attached) is appropriate for a new wall furnace (Empire GWT-35-2; attached). For example, is the vent Type 'B'?

    Any assistance would be appreciated.
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  2. #2
    Join Date
    Jan 2004
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    Lancaster PA
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    That looks to be oval B vent. But can't say for sure from my chair.
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  3. #3
    Join Date
    Feb 2010
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    butler pa
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    looks to be oval b vent from here too

  4. #4
    Join Date
    Jul 2004
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    Massachusetts
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    It's double wall oval, properly termed as W-vent.
    If YOU want change, YOU have to first change.

    If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!

  5. #5
    Join Date
    Jan 2004
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    Quote Originally Posted by skippedover View Post
    It's double wall oval, properly termed as W-vent.
    Hart&Cooley apparently don't like proper terminology then.
    Since they call it Oval B vent.

    There is also BW vent(single story installation only). Which is described as oval B vent.
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  6. #6
    Join Date
    Aug 2004
    Location
    S.E. Pa
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    6,130

    Cool wall furnace

    Oval type BW vent is listed and approved only for listed wall furnaces. Mfrs will make 'oval' type B-vent but it is not recognized in the codes. Mfrs. will tell you that it is ok to transition from round to oval and back to round but it is not approved in the codes. In addition, your appliance must be listed for use with that oval venting.
    The B-vent mfrs know about the code resticting BW vent so they try to get around that by calling theirs 'ocal B-vent'. Nice try. BTW, there are no sizing charts in the code for oval venting. Also, changes to and from oval can have a major impact on venting performance.
    HTH,

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