RAF Fans of the series is the introduction of advanced technology from Europe and the United States self-development of a new roof fan, the smooth exterior design, proportion, sophisticated technology, in line with the requirements of high-end architectural exposed equipment texture. Specific air volume, high pressure, low power consumption, light weight, compact structure, etc., are widely used in machinery, chemicals, rubber, pharmaceutical, textile and other industries workshop plant and senior civil roof ventilation. Made of two structural forms: RAF type conical wheels, twisted wing blades, suitable for low pressure, high flow ventilation occasions. RTCX-II-type using optimization centrifugal impeller, applies pressure to higher occasions exhaust ventilation. According to the different transmission media, made of corrosion proof type. According to user needs can be arranged gravity-return valve, repair switch, and centralized control boxes and other optional accessories. RAF Fans of the series is the introduction of advanced technology from Europe and the United States self-development of a new roof fan, the smooth exterior design, proportion, sophisticated technology, in line with the requirements of high-end architectural exposed equipment texture. Specific air volume, high pressure, low power consumption, light weight, compact structure, etc., are widely used in machinery, chemicals, rubber, pharmaceutical, textile and other industries workshop plant and senior civil roof ventilation. Made of two structural forms: RAF type conical wheels, twisted wing blades, suitable for low pressure, high flow ventilation occasions. RTCX-II-type using optimization centrifugal impeller, applies pressure to higher occasions exhaust ventilation. According to the different transmission media, made of corrosion proof type. According to user needs can be arranged gravity-return valve, repair switch, and centralized control boxes and other optional accessories.