lindab | dampers and measure units Damper with flow meter DIRU Dimensions cking screws higten the lo Tafter djustment Ød 1 Description The damper DIRU with flow meter offers measurement of the air flow. DIRU has the following characteristics: low noise level, centric flow, fixed measurement nozzles for accurate flow measurement and is equipped with regulating facilities that can be fully opened, which means that you do not need cleaning covers. It fulfils tightness class C. The dimension graph is to be used to determine the pres- sure drop over the damper with flow meter and to give infor- mation regarding the sound effect level at different settings. When balancing the system the balancing graph should be used. There is a separate assembly, measuring, balancing and maintenance instruction for dampers with flow meter. 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 graph in order to get the k-factor from a setting value. The air flow is regulated with a handle. Ø 80–630 fullfills pressure class A in closed position. Material The damper is made of hot-dip galvanized sheet steel. Installation Consider required straight distance after or before distur- bance, as mentioned on the card attached to the measure- ment nozzles, to obtain accurate flow measurement. Cleaning By fully open the damper, one get access to the duct. Do not forget to readjust the damper after cleaning. DIRU 125 6524 21-nov-05 Ø D l Ød 1 ØD l m nom [mm] [mm] [kg] 80 135 52 0,60 100 163 54 0,80 125 210 63 1,20 150 230 53 1,40 160 230 60 1,40 200 285 62 2,00 250 333 62 2,60 300 406 65 3,00 315 406 63 3,40 400 560 70 6,90 500 644 60 7,90 630 811 60 11,9 Ordering example Product Dimension Ød 1 DIRU 160 DUCT-MC Identification number 17.11.002 Lindab reserves the right to make changes without prior notice 1 2018-12-11
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