The motor-driven damper DIRBU with flow meter is suitable for systems where it should be possible to increase the air flow or lower it to the basic level. Examples of such systems are conference rooms and public areas.

It fulfils tightness class C. DIRBU is intended for use where you want to be able to set two air flows.

Maximum and minimum flow is set with the measurement nozzles and are fixed with the two end stop screws on the motor.

There is a separate assembly, measuring, balancing and maintenance instruction for this product.

Ø 100–315 fulfills pressure class A in closed position.


By fully open the damper, one get access to the duct. Do not forget to readjust the damper after cleaning.


Consider required straight distance after or before disturbance, as mentioned on page DIRU and on the card attached to the measurement nozzles, to obtain accurate flow measurement.

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