Fantech RSK 5 - 5" Duct Backdraft Damper
The Fantech RSK 5 features damper blades that can be spring loaded for vertical mounting.
The Fantech RSK 5 is designed with a 5 duct. When the exhaust fan is off, unwanted air flows into the house through the exhaust ducts. The RSK 5 prevents unwanted air from making its way inside. It is made from galvanized steel sheets and has 2 lightweight aluminum blades, which are spring loaded for mounting vertically.