Fiberglass roof fan is one of the earliest roof exhaust equipment in China and abroad. Mainly suitable for ventilation and air exchange in hotels, restaurants, theaters, office buildings, laboratories, factories, residential buildings and other buildings. This series of fans has the characteristics of beautiful appearance, compact structure, high strength, light weight, corrosion resistance, anti-aging, low power consumption, low noise, reliable operation, convenient installation and maintenance, etc. The efficiency is increased by 30% compared with similar products by using the inlet and outlet venturi test.