EFD 500 Damper + NF24A motor

Shutter damper EFD is a turn off damper. The damper is provided with 24V AC motor with spring return actuator. EFD are made in leakage performance class 3 according to EN 1751:1998 Annex C.2. Outdoor/exhaust air damper have the function to prevent the hot water battery to freeze. EFD connects to a connection block inside the electrical box.

The EFD consists of a tubular housing equipped with a damper blade pivoting on an axle. The blade fits into the circular duct. The connection ends are equipped with silicon rubber sealing rings. The damper is made from hot-dip galvanised sheet steel. The EFD turn off damper is prepared for external insulation and has arrows showing the damper blade position.

We recommend preventive maintenance of the damper twice per year for optimum performance. If the damper gets dirty, the blade should be cleaned. The gasket sealing should be checked and the blade axle lubricated as necessary.