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  1. #1
    Join Date
    Sep 2019
    Posts
    2
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    What is this and where does it go?

    Hi all,
    I have an older home that currently has a mid-efficiency furnace. It has an exhaust pipe going up to what I assume is the chimney...but underneath the furnace exhaust pipe, there is a second exhaust pipe in the wall that is capped (cap comes off easily). When I look into the pipe, I can see that it clearly goes up (the same direction as the pipe above it connected to the furnace).

    My question is, what is this? Can I use an inline fan to blow the moist air out of the basement through this other pipe?

    How do I post pictures?

  2. #2
    Join Date
    Jun 2014
    Location
    Dover, DE
    Posts
    11,143
    Post Likes
    Post a photo. It’s likely a combustion air supply.
    Exhausting air is a poor method at humidity control. You’ll create a negative pressure in the basement with no make up air, and either start pulling air in from outside or conditioned air from upstairs.
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486

  3. #3
    Join Date
    Sep 2019
    Posts
    2
    Post Likes
    Thread Starter
    overgrow.com/t/what-is-this-and-can-i-exhaust-out-of-it/22526?page=2

    The site page above has pics...cant find how to upload pics here...cant find a help section that instructs how to upload pics either.

    Thanks for the help!!!

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