Backdraft Dampers for Solar Air Heating Collectors

Solar air heating collectors provide a nice stream of heated air during the day when the sun is shining on them, but at night, the flow often reverses and brings unwanted cold air from the collector into the room.

Backdraft dampers are added to prevent this reverse flow of cold air.  There are several types of dampers -- both DIY and commercial.

I've added a section that lists the ones I know about -- if you know of others, please let me know.

New section on backdraft dampers for solar air heating collectors...

A example DIY backdraft damper