QWORK Draft Blocker 12 Inch, Damper Stopper Duct Damper Backflow Preventer Inline Built-in Fan Vent Ventilation Vent Deflector

Additional Details from the Manufacturer

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• Design: 4 Inch Damper Stopper with 2 valves designed for air conditioners (AC), dryers, exhaust units, hoods or range hoods, heating ducts, vents and other HVAC applications. Valve opens and closes automatically at low airflow. It has a smooth running spring and an internal foam strip to prevent rattling of the cutter and can be mounted horizontally or vertically.
• Feature: Backdraft damper for insertion into inch ventilation ducts. The return air damper RKI opens and closes automatically. It has a strong spring and can be mounted horizontally or vertically. The flip-up cover is suitable for retrofitting because it sits completely inside the duct.
• Instruction: Install by inserting it into the vent pipe until it stops. The spring should be positioned horizontally for horizontal installation so that it can optimally open and close. Install the return louvers with the damper blades open in the outlet direction only.
• Application: Return air valves can be inserted into flexible or non-flexible ventilation ducts. Perfect for air conditioners (AC), dryers, exhaust units, hoods or range hoods, heating ducts, vents and other HVAC applications. They cannot be used with plastic ducting because of the difference in size.
• Package Includes: 1 Pack 12 inch backdraft damper ducts.