EC and DC external rotor motor powered backward-curved centrifugal fan series covers a diameter range of models from φ133 to φ500 with maximum air volume up to 8,600m3/h and maximum static pressure up to 680 Pa. 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. After years of independent research and development, these models from φ133 to φ250 with plastic impellers have become among Dunli’s featured products, due to their high efficiency and low noise.This series of centrifugal fans has EC and DC available,Available input power sources for DC series are 12VDC, 24VDC, 48VDC and 310VDC, and for EC series are 115VAC, 230VAC and 380VAC;EC and DC motors make the fans more efficient and, with products also meeting European ErP energy efficiency requirements, it is easier to control the fan and flexibly meet customers’ control requirements.Dunli EC/DC motors come with a variety of control solutions and protection functions - to achieve intelligent control, energy savings and environmental protection at the same time.