Bard HVAC 8406-086BX Pressure Switch Replacement is necessary if the

Replacement is necessary if the furnace fan fails to start after the burner has ignited and reached temperature

Enhanced Durability: Robust contact surfaces resist arcing and pitting during high-load switching

The assembly includes the spring

Durable OEM Construction: Built by Lennox to match the exact specifications required for Lennox and Allied Air branded equipment

055" orifice diameter

Bard HVAC 8406-086BX Pressure Switch Replacement is necessary if theThe Bard 8406 086BX Pressure Switch is a critical safety and performance component designed for specific air proving applications within Bard wall mount units and HVAC systems. This 0. 35" WC SPDT pressure switch functions as a differential air pressure sensor, ensuring proper blower operation and venting before allowing the ignition sequence or cooling cycle to proceed. It is a direct factory replacement and is electrically and mechanically identical