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Old 08-09-2011, 06:11 PM   #1
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Sealing air leaks in ducts

I just had a new Carrier Infinity furnace and ac installed. I noticed that at the four corners at the top of the furnace where the ac coil is attached to the furnace there is air coming out. My installer said it is normal but I'd like to seal the leaks anyway. What's the best way:

1. foil duct tape

2. silcone caulking

3. water based air duct sealant

or is there a better way?


The air leaks are in the four corners where the ductwork is connected to the top of the furnace.


Last edited by saturn711; 08-10-2011 at 09:50 AM. Reason: Adding info
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Old 08-09-2011, 06:48 PM   #2
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Foil tape is the quickest way and less messiest way. Mastic is messy, and takes a little longer to do it without making the mess. I personally would call the installer, and have them tape the joints, especially since you paid them to install the new unit. Was this a company, or some single guy who does this, and handles regular calls for you? If the later, I would just go out and get a roll of the foil tape, and tape up any and all joints. I always keep a roll handy, due to it comes in handy for other stuff, especially when you have to clean out the dryer lint.


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Old 08-09-2011, 09:31 PM   #3
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How about mastic tape??
What kind of lazy installer wont tape the joint between the two units anyway..I bet the inspector would disagree with him.
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Old 08-09-2011, 10:07 PM   #4
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provide pics please of the EXACT area where the leaks are, may be more convenient to use mastic...
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