Item Number: 411115
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