White Rodgers Snap Disc Fan Control

The White Rodgers Snap Disc Fan Control is a furnace fan control (fan switch) that turns the blower motor on and off according to the temperature inside the furnace plenum. It uses a snap-disc bimetal sensing element. The control starts the blower once the heat exchanger has warmed up. It keeps the blower running until the furnace has cooled to a set temperature. This helps deliver warm air efficiently and avoids blowing cold air through the ducts.

Key Features:

• Snap-disc thermal sensing for reliable, repeatable temperature-based switching
• Separate fan-on and fan-off temperature settings to control blower start-up and shut-down
• Designed for replacement use in forced-air furnace heating systems
• Built by White Rodgers, a long-established name in HVAC controls

This product line is available in multiple fan-on and fan-off temperature configurations. Select the variant whose temperature settings match your furnace or the original control being replaced.