I need to put a patch over a 5″ hole in a galvanized duct that I will be using for the kitchen vent fan. Since I can’t find my pop riveter, I will be fastening the patch with sheet metal screws. Since I want this to be reasonably air tight, what is the best material to place under the patch to seal it. Is silicon sealant adequate for this (for the next 30+ years) or do I need to go with epoxy or something else?
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Aluminum foil tape will do the trick nicely.
Dave
The acid in the silicone will degrade the metal. Use aluminum tape.
There is also the duct mastic -- might be good between the layers of metal.
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Thanks folks, I think the duct mastic is what I will look for - in addition to the tape.
the mastic and mesh tate is the way to go..
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