Backdraft Damper, Metal HVAC Ducting Insert Backflow Preventer Draft Blocker Duct Adaptor for Kitchen Bathroom Exhaust Fan ItemPackageQuantity:1 Rivet Grip Size: 4 x

Rivet Grip Size: 4 x 11mm/0

Type: Latching

just insert the forming outlet into the end of the hose without any tools

to replace the screw fasteners

Package Include: 28 x Tube Inserts

Backdraft Damper, Metal HVAC Ducting Insert Backflow Preventer Draft Blocker Duct Adaptor for Kitchen Bathroom Exhaust Fan ItemPackageQuantity:1 Rivet Grip Size: 4 xThe backdraft damper is used to prevent the backflow of smoke or exhaust gas through air duct when the ventilation fan is off, it also prevents debris, dust and odor from entering your room. Widely used in dryers, extractors or range hoods, and other HVAC applications. You can install it in your home, kitchen, bathroom, office or living room which needs a ventilation system. Specification Color: Material: Outer Diameter of Interface: Overall Size: