Fan shutters are fitted on the overpressure side of the fan and thereby reliably prevent undesirable air flows.
The shutters are produced from weather-resistant and UV stabilised rigid PVC and therefore boast a long service life. The frame is closed and torsion resistant.
The flexible frame system means that special sizes are possible in addition to the standard sizes (278 mm to 1,118 mm) for all conventional fans. From a width of 720 mm the shutter is stabilized by a middle frame.