The "X" signifies a notched or cogged design

Is this compatible with single-stage units

Durable Construction: High-grade steel or aluminum blades designed to withstand atmospheric corrosion and high-RPM stress

the T2WF2Z451 is the designated replacement PCB for these specific multi-zone outdoor condensers

Heatcraft Refrigeration 22901101 Blade 322027-701 The "X" signifies a notchedThe Heatcraft Refrigeration 22901101 Fan Blade is a critical OEM replacement part designed for high demand commercial refrigeration condensing units and industrial HVAC systems. This 24 inch, 5 wing assembly is engineered with a 33 degree pitch to optimize airflow and maintain head pressure in Larkin, Bohn, and Climate Control equipment. As a veteran technician knows, matching the exact clockwise (CW) rotation and the 5 8 inch bore size is essential