"Blower Fan" By developing these miniaturization technology, HVAC side viewing area than the company's previous products reduced by about 30%, achieved either in a small car with the performance but also meet the needs of D-level HVAC. English Roots blower, rotary blower system belongs to the volume, the use of two or three-lobed rotor relative movement in the cylinder to compress and transport gas rotary compressor. Such blowers simple structure, easy to manufacture, for low pressure gas delivery and pressurized situations, also be used as a vacuum pump.