You can seal ducts using approved sealant that meets the 181B standards. If
you use a mastic that is not generally intended for ducts, you may be
compromising them depending on the type of duct your working with. Also,
some mastics really stink.
You can find information for proper residential duct assembly by following
If your ducts are solid sheet metal, than the seams should be sealed using
the 181B sealant, Screws and tape. You can find reputable HVAC contractors
who can test your duct to see what percentage is leaking....
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