I have forced air heat through aluminum heating ducts. The 2-story house is 18 yrs old. Heating ducts to the 2nd floor are locate on the inside walls. Therefore, they rise to the second floor and then run under the floor to the outside walls.
The problem I have is the duct to the master bedroom makes noise from heating and cooling and is bothersome at night. I don't want to rip up the textured plaster ceiling in the living room to get access to the duct, or rip up the parquet oak floor in the bedroom. Is their any product that can be inserted down the duct from the register that could be opened to brace the duct where the noise is coming from? Is their any other product that may muffle the sound?
My only other option would be to move the register to the other side of the room and eliminate using the duct under the floor. This however would not provide good circulation through the room.