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BPH_ESPBPH_ESP BPH 710 WHEEL PERFORMANCE CURVE power [kW] efficiencies in %                                                        speed [1/min]  sound power level A-weighted Lwa6       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 -5 -2 -1 -6 -8 -10 -15 -20 BPH 710 outlet -2 0 -4 -4 -4 -7 -12 -17 31