lindab | dampers and measure units Constant-/ variable flow damper Technical data Pressure and flow ranges and sound to duct DAU, DA2EU, DAVU The graphs show A-weighted sound power level, L WA [dB], to duct. These curvs are intended for brief comparision. For more accurate calculation, please use the tables. Example Given: Diameter 125 mm Flow 70 l/s Pressure drop 200 Pa The graph gives: A-weighted sound power level approx. 57 dB The table gives: Sound power level as below Centre fre- quency [Hz] 63 125 250 500 1 k 2 k 4 k 8 k Sound power 52 52 49 49 49 51 51 46 level [dB] Δ p t Ø 80 [Pa] 5 1000 900 55 60 800 700 600 500 50 400 300 45 200 100 40 50 15 20 30 100 v 10 L WA 65 [m/s] [dB] 40 150 q 50 60 200 70 [l/s] 250 [m³/h] Ø 100 [Pa] 1000 900 60 800 v 5 65 L WA 10 [m/s] [dB] 700 Δ p t 600 55 500 400 50 300 200 45 100 40 50 20 30 40 50 60 70 80 90 95 [l/s] 100 150 200 250 300 q [m³/h] Ø 125 [Pa] 5 1000 v 10 900 65 800 70 L WA [m/s] 75 [dB] 700 Δ p t 600 500 60 400 300 55 200 50 100 45 50 40 50 60 70 80 90 100 125 150 165 [l/s] 200 300 400 500 q [m³/h] The grey area in the graph shows the minimum pressure drop needed for the product to start working. Even if the damper blade is fully open you get this pressure drop measured over the product. 3 DUCT-MC Identification number 17.11.002 Lindab reserves the right to make changes without prior notice
Share
Print
Download PDF file
