Shaded pole 3.3-inch diameter HVAC AC motors have a low starting torque that provides a smooth and quiet start up while being more economical than other types of replacement motors used in blower applications such as bathroom fans and range hoods.

Permanent split capacitor (PSC) 3.3-inch diameter HVAC AC motors have a capacitor that decreases the amount of power consumed for a given load. This makes them more efficient than 3.3-inch shaded pole motors while providing smooth and soft start-ups in fans and blowers.

Electronically commutated (EC) 3.3-inch diameter HVAC AC motors have a built-in microprocessor controller for higher efficiency and greater energy savings than general purpose AC motors and can replace shaded pole and permanent split capacitor motors. They can maintain the rated RPM independent of static pressure for better air distribution throughout a ventilated area.