Forward Curved

Efficiency is less than airfoil and backward curved bladed impellers. Usually fabricated at low cost and of lightweight construction. Has 24 to 64 shallow blades with both the heel and tip curved forward. Air leaves the impeller at velocities greater than the impeller tip speed. Tip speed and primary energy transferred to the air is the result of high impeller velocities. For the given duty, the wheel is the smallest of all of the centrifugal types and operates most efficiently at lowest speed.
Applications - Primary applications include low pressure heating, ventilating, and air conditioning applications such as domes- tic furnaces, central station units, and packaged air conditioning equipment from room type to roof top units.