By managing dual-compressor staging and emergency ventilation functions

Precise Flow Verification: Prevents equipment operation during low-flow or NO-flow states to avoid catastrophic heat exchanger failure

and Xtherm series commercial heaters

Flexible Mounting: Lightweight

loose wiring connections at the control board

Lennox 46K12 Fan Blade 321042-401 By managing dual-compressor staging andWhen you're out on a service call for a Lennox condenser, a vibrating or imbalanced fan can lead to premature motor failure. The Lennox 46K12 Fan Blade is the direct OEM replacement designed specifically for heavy duty outdoor units. This 18 inch HVAC fan blade features a 4 blade configuration with a precise 24 degree pitch, engineered to maintain the original static pressure and cooling capacity of the system. Built with a 1 2 inch bore hub, it