inline fan,duct fan,exhaust fan 1 Inlet Dia:350mm ... ,lower rotational speed 3 Shell impeller The introductions of inline ventilator,inline fan,duct fan,,exhaust fan low noise multi-wing ... kind of air blower,has enlarged the blade width,reduced the leaf blade quantity.Compares with the domestic similar products, ... installation,easy to service maintenance and so on characteristics. inline fan (duct fan)