The Trane FAN4073 is a durable 3-blade fan featuring a 27.6" diameter, 18° pitch, and 1/2" bore designed for counter-clockwise rotation. It works by delivering consistent airflow to support efficient heat exchange in commercial and residential HVAC units, including condensers and rooftop systems. https://www.partshnc.com/276-18deg-12-ccw-3bld-fan-5