Caulk around air return?


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Old 07-02-12, 02:28 PM
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Caulk around air return?

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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Old 07-02-12, 03:21 PM
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Sure, why not?

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Old 07-02-12, 04:13 PM
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Not really sure on the "Why not?" part. I just wanted to make sure there were no disadvantages to plugging up basically any leakage I can find. The original installers obviously did a bad job sealing the entire system up and I just wanted to check.
 
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Old 07-02-12, 06:40 PM
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If the ductwork is severely undersized, sealing up leaks may cause problems.

Otherwise, it's a good practice.
 
 

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