This series of new products has been developed in-house. Diameter range is from φ250 to φ800 mm and maximum air volume is up to 25,000m3/h.This external rotor fan series has a compact structure, operates reliably and is both energy saving and efficient. It is designed with low noise, a long service life, and is easy to install. Designed with a forward-curved airfoil profile, the blade has obvious advantages in both energy efficiency and noise performance, when compared with conventional blades.Designed with a forward-curved airfoil profile, the blade has obvious advantages in both energy efficiency and noise performance, when compared with conventional blades.The use of plastic for blades reduces the load on both bearings and the entire rotor power system - further improving product reliability and service life.