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  1. #1
    Join Date
    Sep 2008
    Posts
    6

    Default Sealing around heating vents

    I was wondering what I should use to seal around the heat ducting where it joins the wall register. I rent an apartment and am trying to cut down on heat loss this winter and also seal the apt as much as possible to block out secondhand smoke from the downstairs apartment. The converted house is quite old and the heating system isn't in great shape so where the metal duct comes out into the wall register there are pretty big gaps between the wall and the metal duct and the registers no longer will sit flush into wall as a result.

  2. #2
    Join Date
    Dec 2007
    Location
    MN
    Posts
    455

    Default Re: Sealing around heating vents

    Depending on the size of the gap maybe caulk will work otherwise you might use a can of spray foam.

  3. #3
    Join Date
    Sep 2008
    Posts
    6

    Default Re: Sealing around heating vents

    Thanks for that, do you know of any brands that are temp resistant?

    I looked for high temperature caulk at my home depot but they didn't have any - they also didn't know if the spray foam was safe when exposed to heat- i have used the spray foam liberally around the apartment to block the secondhand smoke and it has been great, but considering the poor air quality already I don't want to risk chemical off gassing if I use the wrong thing.

  4. #4
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Sealing around heating vents

    If I understand this is for forced air heating vents?
    There shouldn't be a need for high temperature materials used for the sealing the gaps .... otherwise the vents wouldn't simply be attached to the wood structure.
    The temperature is likely going to be around 100 degrees F which is not considered high temperature.

    As far as off gasing I don't think there should be an issue unless there's a flame present allowing the material to burn.

    Here's an example of one brand and where they recommend to be used......
    http://greatstuff.dow.com/greatstuff...here/index.htm

    However .... if you have any concerns you could always contact the company for whichever product and find out directly .
    Last edited by canuk; 09-24-2008 at 05:19 PM.
    "" an ounce of perception -- a pound of obscure "
    - Rush

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