Supply Shandong Roots blower, Roots blower, clover Roots blower, from an economic point of view, should be used in small wind turbines: from the point of view of the noise should be used in a large fan. Gas furnace fan with high pressure, flow, low power consumption, low noise characteristics. Fans of the series the pressure is defined as the static pressure in the course of Sino-German much more efficient than other types of gas furnace centrifugal blower, to promote the use of the fan has a large technical and economic benefits. Fan shall be subject to mechanical running test, continuous operation time less than 20 minutes after the bearing temperature stability operation shall not unusual sound, bearing temperature must not exceed the ambient temperature 40% DC bearing the rms vibration velocity shall not greater than 4.6 mm / S. total pressure within the operating range of the fan performance curve deviation does not exceed the design angle of ± 5 °, the efficiency value is not lower than the performance of the corresponding point efficiency relative value of 5% of the fan noise should be consistent with GB / T2888-91 provisions; the fan packaging technology should be consistent with the provisions of JB/T6444-2003.