This mating flange features a magnetic snap‑together design; one half is equipped with a check valve to prevent backflow of smoke and the ingress of external debris into the duct.

The damper is lightweight, opening even in a gentle breeze, and automatically adjusts its opening angle according to the ventilation volume.

It can be connected using a 100 mm exhaust pipe. The magnetic attachment allows it to adhere securely to window screens without damaging the screen structure, making installation convenient and enabling easy removal when needed.