Furnace ducting leaks at duct box
#1
10-26-20, 12:17 AM
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Furnace ducting leaks at duct box
I went under my house today to check for duct leaks and I found a leak on one of the three or four main ducts that attach to the duct box underneath my furnace / AC.
Seems to be leaking at the point where the duct attaches to the air box. What's the best way to fix it?
Seems to be leaking at the point where the duct attaches to the air box. What's the best way to fix it?
#2
10-26-20, 08:10 AM
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You'll need to fully expose the "collar" (sheet metal fitting connecting the flex to the main) to inspect the joint. If there's a small gap, just apply duct sealant marked "UL181...". You'll have to leave the system off for 24 hours to make sure it's fully cured.
If there's a large gap, remove the collar and install an adhesive collar.
If there's a large gap, remove the collar and install an adhesive collar.
