I am in the middle of installing a somewhat complicated A/C ductwork system in my NY house.
I have installed anti viberation pieces in both the cold air return and the supply trunks on either side of the plenum.
I do not know if I am discribing it correctly, but I am talking about a black, rubber-like collar that goes into the ductwork to stop any viberation from the air handler. You install it with s- cleat, but you have a seam where the piece of rubber meets.
How do you seal that flex seam? Do you use some type of adhesive or caulk?