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Old 01-15-2010, 01:57 AM   #1
Join Date: Jan 2010
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HVAC Leak Air

My furnace is leaking air. The fitting that connects the hot air supply elbow to the furnace is too smal. There is about 1/2-1/4 gap. What is the most realible way to fix the gap, without replacing the dutc. Looking for long term solution. I don't think alumin tape would last long.

Note: The pic show similar issue. The ducts are only 4 years old (new home).
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HVAC Leak Air-elbow.jpg  

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Old 01-15-2010, 04:22 AM   #2
An old Tradesmen
Join Date: Oct 2008
Location: PA
Posts: 24,489

HVAC Leak Air

Clean the metal. And then use mastic.

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