7 Inch Metal Backdraft Damper, Airflow Backflow Preventer Vent Draft Blocker Duct Connector for Kitchen Bathroom Exhaust Fan HVAC, Red Plugs with Hex Drive Total Size : 31

Total Size : 31

4 x Wheels

Total Size: 17 x 20mm / 0

Designed with larger numbers of cutting edges than carbide hole saws

7 Inch Metal Backdraft Damper, Airflow Backflow Preventer Vent Draft Blocker Duct Connector for Kitchen Bathroom Exhaust Fan HVAC, Red Plugs with Hex Drive Total Size : 31The 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: Red Material: Iron Outer Diameter of Interface: 175 mm