Shaded pole 4.4-inch diameter HVAC AC motors are commonly used as a replacement motor in attic ventilator applications. They are economical with single-speed operation and a low starting torque that provides a smooth and quiet startup. Motors have stud mounting for many common installations.
Permanent split capacitor (PSC) 4.4-inch diameter HVAC AC motors have a capacitor that decreases the amount of power consumed for a given load making them more energy efficient than 4.4-inch shaded pole motors. They provide smooth, soft, startups in fans and blowers.
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