Fantech RSK 4 Backdraft Damper

Fantech RSK 4 Backdraft Damper 4 in. Duct

• Backdraft dampers with galvanized steel collar and lightweight aluminum damper blades
• Spring loaded for positive closure
• 4″ Duct

Backdraft dampers prevent the unwanted flow of air into a house through exhaust ducts when the exhaust fan is off. These sensitive spring-loaded backdraft dampers will accomplish this with minimal effect on the exhaust stream, while providing a good seal against backdrafts. Each is 3 inches long.