Constant flow damper lindab | dampers and measure units VRL1 Technical data Pressure and flow ranges and sound to duct 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: Flow Pressure drop Diameter 160 mm 40 l/s 100 Pa The graph gives: A-weighted sound power level approx. 43 dB The table gives: Sound power level as below Explanation to Diagrams v : Air velocity Δ p t : q : Pressure loss Volume flow Centre frequency [Hz] 63 125 250 500 1 k 4 k 8 k Sound power 46 50 46 41 37 26 24 level [dB] Ø 80 [Pa] 1 2 300 45 50 250 v 3 4 55 L WA 5 6 [m/s] 60 Δ p t 200 40 [dB] 150 35 100 50 30 30 5 10 15 20 25 30 [l/s] 20 30 40 50 60 70 80 90 100 110 [m3/h] q Ø 100 [Pa] 1 2 3 4 5 6 [m/s] 300 50 55 60 250 45 Δ p t 200 [dB] 150 40 100 35 50 30 30 10 20 40 20 60 80 30 100 120 q 40 45 [l/s] 140 160 [m3/h] Ø 125 [Pa] 1 300 50 250 v 2 3 4 55 L WA 5 6 [m/s] 60 Δ p t 200 45 [dB] 150 40 100 35 50 30 30 10 20 30 40 50 60 70 40 60 80 100 120 140 160 180 200 220 240 260 q [l/s] [m3/h] Lindab reserves the right to make changes without prior notice 3 2020-09-10
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