Lennox WC SPST Pressure Switch

The Lennox WC SPST pressure switch (also called a furnace pressure switch, draft inducer pressure switch or air pressure switch) is a replacement HVAC component for Lennox heating equipment. It monitors air pressure, measured in inches of water column (WC), and helps confirm proper draft before the furnace continues its ignition sequence.

Key Features:

• Single-pole, single-throw (SPST) switch design that opens or closes a circuit in response to pressure changes
• Rated in inches of water column (WC), with the trip point depending on the part number
• Helps ensure the inducer is creating adequate draft before the burners operate
• Replacement part from Lennox, a well-known name in residential and commercial heating and cooling

Choose the part number that matches the pressure setting and original equipment specification for your unit. Each variant in this line uses the same SPST switch design and is intended to restore dependable safety operation in your furnace.