lindab | constant -/variable flow dampers Technical data DAU, DA2EU, DAVU Technical data 1 Pressure and flow ranges and sound to duct 2 3 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. 4 Example Given: Diameter Flow Pressure drop 5 The graph gives: 125 mm 70 l/s 200 Pa A-weighted sound 6 power level approx. 57 dB The table gives: 7 Sound power level as below Centre 8 frequency [Hz] 63 125 250 500 1 k 2 k 4 k 8 k Sound power level [dB] 52 52 49 49 49 51 51 46 9 Explanation to Diagrams v : Air velocity 10 dp t : q : pressure loss Volumeflow 11 Ø 80 v [Pa] 5 10 1000 12 900 55 60 L WA 65 800 1 3 700 [m/ s ] [dB] Δ p t 600 14 500 50 400 15 300 45 200 16 100 40 50 15 20 30 40 50 60 70 [l/ s ] 17 100 150 200 250 [m³/h] q 18 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] 596 We reserve the right to make changes without prior notice
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