Standard universal backdraft damper is designed to automatically close the air duct cross-section in order to prevent free air fl ow in ventilation systems when the fan is not operating; The KLR dampers are gravity dampers: the blades of such dampers open under the action of air fl ow (the air velocity in cross-section on horizontal sections should be at least 6 m/s, on vertical sections - at least 4 m/s) and automatically return to their original closed position when the air supply is stopped.

They are made of both rectangular and round cross-sections.

Design: