Originally Posted by wartrock
I had a new heat pump installed and return ducts installed in 3 of our rooms. I also had the installers put venting into a sunroof that we plan on insulating and using more on a regular basis. The bents they installed cannot be shut off and I am not sure of they are what should have been installed. Here is a pic. These are the same vents they installed in the other three rooms for returns.
On the most part we do not put shut offs on the return air vents. If you don't pump air into a room to pressurize the room then the return air vent will not pull much air into it. If its a room that you want to turn off the air flow 100% then you can put a turn off on it. We do not want people to turn off too many return air and burn up there furnace. Paul