The Imperial 1127 Fan Switch SPDT 7/8" x 1-1/2" is a durable single pole double throw (SPDT) switch designed to control fan operation efficiently in heating, cooling, or ventilation systems. It functions by allowing the user to alternate between two output circuits from a single input, enabling smooth fan speed or mode selection. Built with reliable materials and a compact 7/8" x 1-1/... https://partsfe.com/fan-switch78-x-1-12-spdt-for-imperial-part-1127