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  1. Replies
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    I'm getting ready to assemble some ductwork....

    I'm getting ready to assemble some ductwork. Advice from an HVAC relative is to use silicone caulk to seal takeoff collars, duct joints, etc. Everything I read here references mastic/mesh and/or...
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    Thanks for the reply. The inside duct insulation...

    Thanks for the reply.
    The inside duct insulation is about 3/4" thick, so I can see the 3/4" edge that is not sealed with the black tar-looking stuff. What should I use to seal that edge with? Tape...
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    1,248

    The return ductwork and the first 3 feet of the...

    The return ductwork and the first 3 feet of the supply ductwork (metal) have been insulated inside the duct. Most of the fiberglass I can see inside is covered with a black coating, which I'm...
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