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  1. #1
    Join Date
    Nov 2019
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    SHORTENING A CONCENTRIC VENT KIT

    Hi, I need to shorten a horizontal installations concentric vent kit for a 40k 96% furnace. I need to shorten it 1"-2" shorter then instructions call for. Has anyone had any problems with this?

  2. #2
    Join Date
    Apr 2003
    Location
    Maple Grove, MN
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    3,253
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    I wouldn't think it would be a problem, as long as everything comes apart and you can cut off the exact same from both of the pipes.

  3. #3
    Join Date
    Aug 2002
    Location
    Southold, NY
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    26,109
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    I would shorten the pipes!

    Why the termination?

  4. #4
    Join Date
    Oct 2009
    Location
    new jersey
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    480
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    I have had places where we shortened it an inch or two

  5. #5
    Join Date
    Jun 2012
    Location
    Northern NV
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    Why? Roof penetration will need snow clearance. (assuming you get snow.)

  6. #6
    Join Date
    Jan 2010
    Location
    Sea to Sky
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    Quote Originally Posted by Juan Madera View Post
    Why? Roof penetration will need snow clearance. (assuming you get snow.)
    He said it was a horizontal installation....so unless his house blew onto its side.....

    Sent from my SM-G965W using Tapatalk

  7. #7
    Join Date
    Nov 2019
    Posts
    7
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    Thread Starter
    Thanks for your thoughts. The instructions said I could shorten one of the pipes(3") in the concentric kit to 12" and the the 2" pipe accordingly. That would be about 5" cut off the overall dimension Length of the kit. I needed to cut the pipe to 10" reducing the overall length by 7 ". Finished the install and seems to be working fine.

  8. #8
    Join Date
    Apr 2006
    Location
    Houston, Texas
    Posts
    30
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    You probably know this , but i wanted to throw it out there. Be sure to remove any burrs or small pieces of pvc if you use a saw to cut the pipe. The shavings can clog the drainage

  9. #9
    Join Date
    May 2014
    Location
    Bay Area California
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    Not sure you can get eccentric fittings in PVC, but if it was metal, that's what I would have gotten. Or have made.


    Quote Originally Posted by a1cycler View Post
    You probably know this , but i wanted to throw it out there. Be sure to remove any burrs or small pieces of PVC if you use a saw to cut the pipe. The shavings can clog the drainage
    I do a triple evac with nitro to remove non condensables.

  10. #10
    Join Date
    Jul 2018
    Location
    Wisconsin
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    1,103
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    Quote Originally Posted by BBeerme View Post
    Not sure you can get eccentric fittings in PVC, but if it was metal, that's what I would have gotten. Or have made.
    I have used eccentric pvc fittings on a horizontal furnace that needed a 3inch vent but came out of the furnace 2inch

    Sent from my SM-G960U using Tapatalk

  11. #11
    Join Date
    May 2014
    Location
    Bay Area California
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    Quote Originally Posted by Spitz View Post
    I have used eccentric pvc fittings on a horizontal furnace that needed a 3inch vent but came out of the furnace 2inch

    Sent from my SM-G960U using Tapatalk
    I do a triple evac with nitro to remove non condensables.

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