Tamar Backwater flap

Backdraft dampers prevent air from taking the wrong path. With a backdraft damper, I can restrict the airflow in one direction. Without a backdraft damper, fresh air may enter the ventilation duct when the ventilation is turned off or throttled, causing an unwanted overpressure. These dampers are often installed after T-distributors or Y-pieces to prevent unwanted air from entering another room.

These dampers from Systemair can be used in all standard hoses or spiral ducts.