S - Gravity shutter

Gravity shutter for fans QCS, QCM & QCL. It avoids heat loss and entry of wind, rain and birds. The fins of the shutter are opened by the air flow when the fan is working and they close down by gravity when the fan is switched off. The frame is in steel sheet painted with epoxy powder coating and the fins are in techno-polymer. The use of the gravity shutter causes a small capacity reduction.