The damper DIRU with flow meter offers measurement of the air flow.
DIRU has following characteristics: low noise level, centric flow, fixed measurement nozzles for accurate flow measurement and is equipped with regulating facilities which can be fully opened, which means that you do not need cleaning covers.
It fulfils tightness class C.

The damper blades forms a measuring flange which allows flow measuring. By measuring the pressure difference between the measure nozzles, you can through the equation on the damper derive the flow q [l/s]. The setting value of the damper and the correction factor (k-factor) is the same number which means that you do not have to read a graphs in order to get the k-factor from a setting value.

The air flow is regulated with a handle.

A special mounting, measuring, balancing and maintenance instruction exists for this product.


The damper is made of hot-dip galvanized sheet steel.


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


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

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