I have a Mansfield that I bought new last year. When I close the air control down to 1/4 open the air "flaps" that slide to close the intake start to vibrate. It get loud!! The air being sucked in makes the thin piece of metal bounce back and forth. I stopped this last year by folding a piece of aluminum foil into the shape of a gum wrapper and sticking it between the slide and the intake. It works, but sometimes falls out. Any thoughts on a more perm solution?
Thanks
Thanks