MACHSWON 3 Inch 4 Inch 5 Inch Backdraft Damper, 1 Set ABS Flexible Airflow Inline Backflow Duct Adaptor Draft Blocker for Bathroom Exhaust Fan

• -Material:The vent ducting damper is made of durable ABS plastic, which has waterproof and high hardness, not easy to scratch, oil resistant, high temperature resistant, moisture-proof and easy to clean, which can be applied for a long time.
• -Application:When the exhaust starts, the air pressure will push to open the valve for air discharging; after the exhaust stops, the damper valve will automatically close and remain closed all the time to prevent odor, making your indoor environment full of fresh air.
• -Advantage:The backdraft damper is used to prevent the backflow of lampblack or exhaust gas through air duct when the ventilation fan is off, it also prevents debris, dust and odor from entering your room.
• -Installation:You can apply sealing glue around the bottom of the backdraft damper and fix it with screws to the vent hole on the wall;Finally install the vent hose(not included) to the damper and seal with tape if necessary.
• -Usage: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.

Feature: 1.Made of durable ABS plastic, corrosion-resistant, sturdy and durable. 2.When the exhaust starts, the air pressure will push to open the valve for air discharging; after the exhaust stops, the damper valve will automatically close. 3.Easy to use,apply sealing glue around the bottom of the backdraft damper and fix it with screws to the vent hole on the wall, install the vent hose(not included) to the damper and seal with tape. 4.Designed for dryers, extractors or range hoods, and other HVAC applications. Can install it in home, kitchen, bathroom, office or living room. Specification: Material :ABS plastic Color: Yellow Package include: 1pcs x Backdraft Damper Key Notes: 1.Please confirm the outer diameter of the backdraft damper before placing an order. 2.Please allow 0.1-0.5mm error due to manual measurement.