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External rotor backward centrifugal fans, no volute form, supporting a variety of purification HVAC equipment, installed in the device box, fan rotating centrifugal air when air encounters inside box wall formed when very high air pressure and lianyuan constantly penetrates the filter layer, forming with axial flow,

External rotor backward centrifugal fans, high pressure, large air volume, obviously, a great choice for smaller HVAC equipment.