Lennox 21709 Blower Wheel 30067439-890 this air pressure sensing switch

this air pressure sensing switch monitors the vacuum created by the draft inducer motor to ensure the venting system is clear of obstructions before the ignition sequence begins

OEM Compatibility: Exact factory replacement for 940-C411-72

Whether you are performing a post-burnout recovery or standard seasonal maintenance

A tripped limit switch usually indicates restricted airflow due to a dirty filter

Lennox 21709 Blower Wheel 30067439-890 this air pressure sensing switchThe Lennox 21709 Blower Wheel is a critical OEM replacement part engineered for high performance air delivery in residential and commercial furnace blower assemblies. This 10 5 8" x 7 1 8" centrifugal blower wheel features a 1 2" bore size and a robust 1 set screw design to ensure a secure, vibration free connection to the direct drive blower motor shaft. Designed for clockwise (CW) rotation (hub end), this wheel provides precise 48 blade alignment