CRM

Circular airflow measurement and commissioning damper. The CRM consists of a duct section with a damper and measuring device. The connections are fitted with rubber seal ring. The damper has a lockable knob for manual adjustment and indicators for open and closed damper blade position are stamped in the damper’s exterior surface.

Inside the damper, there is a measurement unit and a damper blade. The damper blade is available as a solid blade with rubber gasket (Ductwork leakage class 4), or as a perforated blade without rubber gasket (Ductwork leakage class 0). Ductwork leakage classification according to SS-EN1751 och VVS AMA 98. Tightness Classification according to EN 1751 and VVS AMA Pressure Class A with 1000 Pa as the highest pressure difference over damper blade in closed position. Tightness class C on the housing and tightness class 0 for closed damper.

When motorised control is selected, the damper knob shelf is replaced by a larger actuator support shelf. The motorised control requires an actuating torque. Standard supporting shelves are 80 mm high to allow possible duct insulation.

The entire damper is made of galvanized sheet steel.