Proper way to connect flex to metal plenum?
What is the correct method for connecting flex duct (R-8) to a metal plenum? Mine were taped in place (metal duct tape) and my air handler has blown them off the metal flange. Should these be screwed in + the tape? The flex duct doesn't seem to have much to screw into.
Also, is a big zip tie OK to hold the insulation in place?
We had our duct work replaced due to flooding last year and one of the connections has broken. I want to bring the company out to fix the problem but want to know the correct way to install so I can ensure a correct fix.