lindab | dampers and measure units Constant-/ variable flow damper Technical data Sound to duct Sound power level, L W [dB], to duct in octave bands 1–8, 63–8000 Hz, as function of diameter, pressure drop and flow. DAU, DA2EU, DAVU Pressure Velocity app. 2,5 [m/s] Ød 1 loss [Pa] Centre frequency [Hz] 63 125 250 500 1k 2k 4k 8k Flow 15 [l/ s ] 1000 51 49 44 44 46 49 49 44 500 45 43 38 38 40 43 43 38 80 200 37 35 30 30 32 35 35 30 100 32 30 25 25 27 30 30 25 50 26 24 19 19 21 24 24 19 Flow 20 [l/ s ] 1000 56 53 48 48 50 53 54 48 500 49 46 41 41 43 47 47 42 100 200 39 37 31 31 33 37 37 32 100 34 31 26 26 28 32 32 27 50 26 24 18 18 20 24 24 19 Flow 30 [l/ s ] 1000 60 58 52 52 54 58 58 53 500 54 52 46 46 48 52 52 47 125 200 46 44 38 38 40 44 44 39 100 40 38 32 32 34 38 38 33 50 34 32 26 26 28 32 32 27 Flow 40 [l/ s ] 1000 62 59 52 52 55 59 60 54 500 56 53 47 47 49 53 54 48 160 200 49 46 39 39 42 46 47 41 100 43 40 33 33 36 40 41 35 50 37 34 27 27 30 34 35 29 Flow 70 [l/ s ] 1000 66 63 57 57 59 63 63 58 500 59 56 50 50 53 57 57 52 200 200 50 47 41 41 43 47 47 42 100 43 40 34 34 36 40 40 35 50 37 34 28 28 30 34 34 29 Flow 110 [l/ s ] 1000 67 64 59 59 61 65 65 60 500 60 57 51 51 53 57 57 52 250 200 50 47 41 41 43 47 47 42 100 43 40 34 34 36 40 40 35 50 35 32 26 26 28 32 33 27 Flow 170 [l/ s ] 1000 69 66 60 60 62 66 67 61 500 61 58 52 52 54 58 59 53 315 200 50 47 41 41 44 48 48 43 100 42 40 34 34 36 40 40 35 50 35 32 26 26 29 33 33 28 Velocity app. 6 [m/s] Centre frequency [Hz] 63 125 250 500 1k 2k 4k 8k Flow 30 [l/ s ] 56 56 53 53 53 55 55 50 51 51 49 49 49 51 50 46 45 45 43 43 43 45 44 40 41 41 39 39 39 41 40 35 –– – – – – – – Flow 45 [l/ s ] 59 59 57 57 57 59 58 53 54 54 51 51 51 53 53 48 47 47 44 44 45 47 46 41 42 42 39 39 40 42 41 36 –– – – – – – – Flow 70 [l/ s ] 64 64 62 62 62 64 63 59 59 59 56 57 57 59 58 53 52 52 49 49 49 51 51 46 46 46 44 44 44 46 45 40 –– – – – – – – Flow 120 [l/ s ] 67 67 65 65 65 67 66 61 61 61 59 59 59 61 60 55 53 53 51 51 51 53 52 47 48 48 46 46 46 48 47 42 –– – – – – – – Flow 180 [l/ s ] 69 69 66 66 66 68 68 63 62 62 60 60 60 62 61 57 54 54 51 51 52 54 53 48 47 47 45 45 45 47 46 42 –– – – – – – – Flow 300 [l/ s ] 70 70 67 68 67 69 69 64 63 63 61 61 61 63 62 57 55 55 53 53 53 54 54 49 49 49 47 47 47 48 48 43 43 43 40 41 40 42 42 37 Flow 470 [l/ s ] 70 70 68 68 68 70 69 65 64 64 62 62 62 64 63 59 56 56 54 54 54 56 55 50 50 50 47 47 47 49 49 44 –– – – – – – – 5 DUCT-MC Identification number 17.11.002 Lindab reserves the right to make changes without prior notice
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