When replacing an existing unit

this plated spring is suitable for natural

ensuring identical electrical and mechanical specifications

and 1453821

On the secondary side

White-Rodgers 3F05-2 Fan Switch When replacing an existing unitThe White Rodgers 3F05 2 is a heavy duty adjustable snap disc fan control engineered for high reliability air management in HVAC systems and industrial heating units. As a high performance 3 4 inch fan switch, this 74T12 310709 model features a single pole single throw (SPST) configuration with a close on rise switch action. It provides a field adjustable temperature range from 140F to 180F and a fixed 20F differential, ensuring precise fan cycling