Lennox 51W91 Furnace Pressure SwitchThe Lennox 51W91 Furnace Pressure Switch is a reliable control component designed for safe furnace operation. This Type Pressure Switch is used On Furnace to monitor draft pressure and ensure the burner only ignites when its safe, delivering dependable performance with a 0. 95 Inch WC pressure rating. Designed as an OEM Lennox replacement part, this furnace pressure switch supports robust safety controls in a variety of gas furnaces. Its durable

Featuring a 210°F setpoint and the L210-30F configuration

this zone valve handles hot and chilled water with glycol blends for versatile HVAC performance

Compatibility: fits Grundfos UP circulating pumps

Easy installation and compatibility with Honeywell burner controls and gas control systems

this synthetic-media filter delivers steady airflow at up to 2000 CFM while maintaining low resistance—0

industrial-grade construction for reliability

and dependable operation in residential and light commercial cooling setups

Terminal: 5/8 inch connector

consistent response

and CSA approvals for safety and compliance

Emergency exposure limit 65 psi

Replacement blower wheel for Armstrong 45M06