BPH 225 WHEEL PERFORMANCE CURVE power [kW] efficiencies in % speed [rpm] sound power level Lwa6 [dB] volume flow rate V [m³/h] FAN SIZE "K" factor correction for spectrum noise of BPH Octave band (Hz) 63 125 250 500 1K 2K 4K 8K inlet -12 -10 -6 -7 -9 -12 -17 -22 BPH 225 outlet -10 -8 -4 -5 -7 -10 -13 -18 11