I ordered some wood return air duct vents to replace my old metal ones. I
was concerned that the new vents did not move the same amount of air so I
ordered a larger vent than what is in the wall right now. When I saw the
new wood vents I was correct in worrying but the larger size makes things
right. My problem is that there is a metal band that runs around the 1/2
inch edge of the drywall of the old hole. I don't know why it is there.
Where can I go so I can get some new metal bands in the proper size?