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90 VOLUME CONTROL DAMPER MOTORISED Model ADVCDMOT Damper For Manual Balancing and Motorised Opposed Blade Dampers, the pressure drop should not exceed the values calculated from the 1981 SMACNA duct design tables. Loss Coefficients for air at 1.2kg/m3 Density. C=PD / (0.6 x V 2 ) Pressure Drop (Pa) 50 333 83 37 21 13 9.3 6.8 5.2 4.1 3.3 2.8 2.3 100 667 167 74 42 27 18.5 13.6 10.4 8.2 6.7 5.5 4.6 150 1000 250 111 63 40 27.8 20.4 15.6 12.3 10.0 8.3 6.9 200 1333 333 148 83 53 37.0 27.2 20.8 16.5 13.3 11.0 9.3 300 2000 500 222 125 80 55.6 40.8 31.3 24.7 20.0 16.5 13.9 400 2667 667 296 167 107 74.1 54.4 41.7 32.9 26.7 22.0 18.5 500 3333 833 370 208 133 92.6 68.0 52.1 41.2 33.3 27.5 23.1 600 4000 1000 444 250 160 111.1 81.6 62.5 49.4 40.0 33.1 27.8 700 4667 1167 519 292 187 129.6 95.2 72.9 57.6 46.7 38.6 32.4 800 5333 1333 593 333 213 148.1 108.8 83.3 65.8 53.3 44.1 37.0 900 6000 1500 667 375 240 166.7 122.4 93.8 74.1 60.0 49.6 41.7 1000 6667 1667 741 417 267 185.2 136.1 104.2 82.3 66.7 55.1 46.3 1100 7333 1833 815 458 293 203.7 149.7 114.6 90.5 73.3 60.6 50.9 1300 8667 2167 963 542 347 240.7 176.9 135.4 107.0 86.7 71.6 60.2 0.5 1 m/s 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 Core Velocity (m/s)

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