Systemair RSK 8 Backdraft Damper - 8" Back-draft damper for circular duct, single

Backdraft damper for circular ducts, manufacturedfrom galvanized sheet metal. The two bladesare spring-loaded. Every damper is built with performance in mind. The damper can be mountedvertically. Damper blades formed from aluminum H14 3/32" diameter brass central rod Stainless steel torsion spring 24 GA, G90 galvanized steel casing EPBM synthetic rubber gasket