When I removed the registers in the ceiling of our house I noticed that the ducting in the ceiling was totally loose. They are not secured in any way. The two screws of the register was what was holding them in place.
What is the proper way to secure those final duct connections (the ones that the register is attached to) in the attic? Screw them down to the attic floor?
We have flexible ducting. The end of the duct is attached to rigid pieces.