Caulk around air return?

atdevJuly 2, 2012

Our upstairs air conditioning unit is in our basement and sits on the concrete slap. The return air duct connects to the bottom. However the bottom has a small gap where it meets the concrete and air is getting sucked in through there all around the edges. Should I caulk around this with silicone? Pictures with notes...

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    Bookmark   July 3, 2012 at 10:16AM
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I would also keep a close eye on that tape that is on the ducts as it will eventually loosen up and leak if it isn't mastic tape. I would use a brush on mastic and cheap brush or use mastic tape to replace it. Matrix trap pure is harder to find but from what I have heard it seems to work well. Any other leaks that you attack with caulk and a f oam caulk combo will really pay off.

    Bookmark   July 5, 2012 at 8:17PM
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