Fantech RSK 6 - 6" Duct Backdraft Damper
The Fantech RSK 6 Backdraft Damper is made for circular ducts.
The Fantech RSK 6 is a back draft damper with a 6 duct. This damper prevents unwanted drafts of air from getting into the house through the exhaust duct, when the exhaust fan is off. The RSK 6 is made from galvanized steel and has 2 lightweight aluminum blades. This damper can be mounted vertically as the blades are spring loaded.