White Rodgers 3F05-2 Adjustable Snap Disc Fan Control F - 140-180

The White Rodgers 3F05-2 is an adjustable snap disc fan control designed to automatically control furnace blower fans based on plenum temperature. This bimetallic snap disc thermostat provides reliable temperature sensing and switching to optimize furnace efficiency and comfort.

Key Features:

• Adjustable temperature range from 140°F to 180°F for customized fan operation
• Snap-action bimetallic disc provides precise temperature control
• SPST (Single Pole Single Throw) switching for simple wiring
• Mounts directly in furnace plenum for accurate temperature sensing
• Automatic fan control improves energy efficiency and comfort
• Rugged construction for long-lasting performance in HVAC applications

This fan control is commonly used in gas and oil-fired forced air furnaces to turn the blower fan on when the plenum reaches the set temperature and off when it cools down. The adjustable setpoint allows technicians to optimize fan timing for different furnace designs and climate conditions.