The Reznor 195643 Rectangle Capacitor is an electrical component designed to support motor starting and operation in HVAC equipment. It stores and releases electrical energy to create the phase shift needed for efficient motor startup and smooth running. Commonly used in unit heaters, fans, and blower motors within Reznor heating systems, this capacitor helps ensure reliable motor performance. Its compact rectangular design allows easy installation, while stable capacitance improves efficiency, reduces electrical strain, and extends motor service life.