Product Type: FBH190063BD4 impeller size: 190 * 63mm Rated voltage: 48VDC Rated speed: 3000rpm Rated Current: 1.10A Operating voltage: 36.0 ~ 57.0VDC fan has from the start, the signal output, PWM function motor with soft start, stall, Overvoltage, overload and polarity protection Maximum air flow: 696 m3 / h maximum wind pressure: 445 Pa Noise level: 62 dB (A) Temperature range: -20 ~ + 70 ° C bearing structure: double ball bearings imported NMB deep Estimated groove bearing life: Estimated at 40 ° C the life of 60,000 hours of rotation: clockwise rotation of the rotor face leads the way: from the motor impeller outlet 500mm long Material: PA66 + 25% GF, UL94V-0, with one piece Lotus impeller .