Powerful & Efficient Performance? Equipped with a 1/3 HP blower motor, operating at 115V and 1075 RPM with 4 speeds, this blower motor delivers steady airflow for optimal furnace heating and energy efficiency. Direct Replacement? Replacement for Lennox part numbers 60L21, 60L2101, 29W71, 21W85 and compatible with Armstrong, Ducane, Allied, Concord models. Fits US Motors K55HXHFZ-8638 and similar OEM parts for wide application. Rotation and Shaft? Standard counterclockwise (CCW) shaft rotation with 1/2 inch diameter and 4 inch shaft length. Compare product with your original to ensure proper fit. Original product box has light damage.