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  1. #1

    Are These Old Damper Holes?

    I've just moved into a new house, and the ductwork in the basement has a bunch of 1" (or so) diameter holes in the bottom sides of the ducts -- they are usually at the ends or at junctions of ducts. I'm thinking they are about the size of the holes that I've seen in the house I grew up in that had old swing-arm dampers.

    The house has a natl gas furnace with a heat pump.

    Is it safe/smart for me to have these holes sealed? They do blow a warm air into the unfinished basement.

    Thanks in advance for any help!
    Carol

  2. #2
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,855
    Most likely were made to clean the duct system. They should have small plugs in them.
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  3. #3
    Thank you. What do the plugs look like? (I'm wondering if they are around somewhere in the basement with the extra tile, etc. that previous residents left here.)

  4. #4
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,778
    little rubber plugs but around here they never get put in, duct cleaning usually does nothing more than stir up dust and make more leaks in the duct which is where the dust came from in the first place. A little piece of foil duct tape over each hole should do the trick.

  5. #5
    Join Date
    May 2008
    Location
    Missouri
    Posts
    3,618
    pictures would be nice! Agree with jt, simply cover with foil tape!

  6. #6
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,855
    most use round cheapo plastic pop in caps. Kids like them for some reason. Use good commercial grade foil tape like the others suggest.
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  7. #7
    Thanks to all who answered! I'll get them sealed up!

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