Wtih 18 years of experience of ventilation product, we are at the cutting edge of technology in our main areas: 1.Air Curtains,2.Residential Ventilating Fans,3.Industrial Exhaust Fans,4.External Rotor Motor,5.Powerful Small Blowers,6.Circular Duct Fan,7.Window Type Ventilators,8Fresh-air Exchangers,8.Fire-fighting(vertical,axial) Ventilators and so on.