Characteristics of annular pressure blower (pump) : & have spent Small, light weight, high wind pressure: forward blade design, small volume, light quality and more high pressure produced. & have spent Low noise: new design, can eliminate cut generated when the wind sound attenuation of high frequency collection of special material, greatly reduce the noise ratio. & have spent Ground motion: blades have been computer balance calibration with high precision mechanical processing, make the vibrations to a minimum