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  1. #1
    Join Date
    Nov 2008
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    DFW,TX
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    Confused re-routing Vent stack in attic??

    ok dont but my head off here but i had no choice LOL

    needed to add furnace/coil that was 11inches longer than old system and the left side Rplenum is up against Roof Post, cant cut that, right side Splenum upagainst a bathroom PVC vent stack..i was forced to cut it to allow for new system so its about 6inch off set now.

    Question,

    do these have to be staring all the way through the roof termination or can i siply grab some pipe and 90s and re-route back around plenum..??

    whats the code for this, being a vent stack doesnt seem like it'd be an issue just routing it back around given the weird way they vent some retrofits nowadays with the little deal on end of pipe..

    anyway please advise..thx

  2. #2
    Join Date
    Mar 2013
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    Billington Heights, NY
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    As long as any water inside doesnt pool anywhere you can reroute it without issue.
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"

    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

    Jtrammel - "I’m going to sell hvac systems derp derp derp"
    BBeerme - "every time he opens his mouth, he reminds me of a cow without the fart bag."

  3. #3
    Join Date
    Nov 2008
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    Thread Starter
    Quote Originally Posted by HVAC_Marc View Post
    As long as any water inside doesnt pool anywhere you can reroute it without issue.
    cool so going a little horizontal to vertical back to horizontal back to vertical is ok as long as it has some fall/drop as it goes down..i saw a few like this from new construction but most go straight up..

  4. #4
    Join Date
    Mar 2013
    Location
    Billington Heights, NY
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    yes, that's correct. pitch is good
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"

    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

    Jtrammel - "I’m going to sell hvac systems derp derp derp"
    BBeerme - "every time he opens his mouth, he reminds me of a cow without the fart bag."

  5. #5
    Join Date
    Sep 2014
    Location
    NW Arkansas
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    Try to avoid hard 90's and a 90 right off the unit if possible. Also, if you are adding fittings you may end up increasing the pressure drop past the acceptable range of your current pipe size. In the manual for the furnace they usually give the sizes required for the length run (remember a small 90 bend could actually have a large equivalent length)

    Sent from my SAMSUNG-SM-G891A using Tapatalk

  6. #6
    Join Date
    Feb 2014
    Location
    Phoenix Arizona
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    Quote Originally Posted by Snaple4 View Post
    Try to avoid hard 90's and a 90 right off the unit if possible. Also, if you are adding fittings you may end up increasing the pressure drop past the acceptable range of your current pipe size. In the manual for the furnace they usually give the sizes required for the length run (remember a small 90 bend could actually have a large equivalent length)

    Sent from my SAMSUNG-SM-G891A using Tapatalk
    I think he is referring to an ABS sewer vent, Not a flue for a 90% FAU. (said it was from a bathroom)

    OP, in either case 45°s and sweep 90°s are much preferred to hard 90°s.
    And if it is ABS(the black pipe that looks like PVC), then you need to make sure and use ABS pipe, fittings and glue. Regular PVC on ABS is a no no.


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