Rheem-Ruud 42-101443-89 Pressure Switch 0.45 WC HVAC Furnace

The Rheem-Ruud 42-101443-89 is a pressure switch designed for use in residential and light commercial HVAC systems. This pressure switch is calibrated to operate at 0.45 inches water column (WC), making it suitable for monitoring draft pressure in gas furnaces and ensuring safe operation of the heating system.

Key Features:

• Pressure rating of 0.45" WC for precise draft monitoring
• Genuine OEM replacement part ensuring proper fit and function
• Safety switch that prevents furnace operation under improper draft conditions
• Designed for Rheem and Ruud furnace models
• Helps ensure proper venting and combustion air flow

This pressure switch is a critical safety component that monitors the pressure differential in the furnace venting system. When proper draft pressure is detected, the switch closes to allow the furnace to continue its heating cycle. If insufficient draft is present, the switch remains open, preventing potentially dangerous operation.