Broan RVK1A 4" Diameter Roof Ducting Kit
Roof Ducting Kit - Model Rvk1A For complete roof ducting installation of exhaust fans with 3" or 4" duct connector. Black Steel Roof Cap With Built-In Back Draft Damper And Bird Screen 4" Diameter Metal Duct Connector Two Nylon Zip Ties 3" To 4" Duct Adapter 8’ Of 4" Diameter Flexible Foil Ducting Conforms To ul 181 Class 1 Air Connector Requirements Do Not Use For Dryer Venting