... easy to install. Fiberglass FRP Axial Ventilation Fans for Chemical, Medical, dyeing and printing industryApplication:smoke ventilation fans;portable ventilation fan,tunnel ... 15°, 20°, 25°, 30°, 35° . So the air volume and power of each fan is different.Of course, Fans will ... as to customers' requirement. Industrial GRP Axial Ventilation Fans for Chemical, Medical, dyeing and printing industry