Centrifugal Outer-rotor F-category Insulated Ventilator produced by Siemans technology which features low-noise and large airflow velocity sustained around 0.3m/s in the operational area,with not only ensures the paint-coat to form as required but also improves the paint consumption efficiency. Meanwhile it meets the demand for satisfactorily clean air for the good of operator`s health in the area.The positive internal air-pressure effectively prevents the dust without from going into the area so that the quality of paint spraying is thus guaranteed