Features an electronically commutated (EC) motor that can provide up to 60% energy savings. Potentiometer dial on motor allows speed control down to 80%. Ventilator has aluminum, backward-inclined wheel and 1-pc. rolled aluminum windband fully welded to base. Motor, drive frame, and blower wheel are isolated from mounting base. Motor compartment is isolated from contaminated air. NEMA 1 junction box in motor enclosure.