manual air duct damper installation

Go down to where the ducts come out of the furnace. Identify the line you want to install damper. Open duct and drill two holes directly across from each other. Take your damper and undo the nut and washer on the one end and install in the holes you just drilled. Reattach the washer and nut and now re connect the duct seal it with duct tape and you will be good to go.

If you have 6 inch ducts get a 6 inch damper. But be sure to do everything at the beginning on the duct as to divert air to other ducts.

I have to tell you that changing your air flow could develop problems if you do very many ducts. So be very aware of what you doing. All systems are put in with air flow in mind.