Should I Seal Return Air Duct? - HVAC - DIY Chatroom Home Improvement Forum

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Old 11-12-2007, 09:30 AM   #1
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Should I seal return air duct?

I got a new gas pak last year. The contractor hooked the return air duct to it using duct tape. When I went under the house yesterday I could hear air leaking.

Should I seal it up air-tight with mastic, or is it better to leave it leaky (to allow fresh air into the house)?


phareous is offline   Reply With Quote
Old 11-12-2007, 11:14 PM   #2
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leaky duct

Though sometimes fresh air in a house is a good idea, from the basement or from under the house doesn't sound too wise. Mastic would probably introduce an uncomfortable odor. Get a water-based latex duct sealer from your local HVAC supplier if you can't get the contractor to come back out and do HIS job.


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