Product review (4 stars): Increases air flow
Product allows for more air flow, which is it's function. Only negative is, you will lose connection at wall, when you move dryer. Seal will be reestablished when fitting is pushed back into wall, this probably requires being able to reach the connection. As long as you don't need to move dryer for any reason, everything is good. Also, I could not fit wall flange flat against wall, it sticks out about 1/2 inch. I have an elbow in wall that will not push back far enough to allow flange to fit flat. Not that big a deal, with dryer in place, you probably won't see it. With the greater air flow than the plain flex duct I replaced, the clothes dry in shorter time.