OEM 1/2 HP Furnace Blower Motor Replaces Emerson US Motors K55HXRDV-1888. This is a brand new OEM upgraded 1/2 HP Furnace Blower Motor. It is a direct replacement for Emerson US Motors. It is rated at 1/2 HP, 115 volts, and 1130/4 SPD RPM. If the shaft is seen facing up (as in the photo) the rotation is counter-clockwise. It replaces the part numbers listed below. An electric motor converts electrical energy into mechanical energy. In an HVAC system, motors typically turn the air conditioning fan blade and the furnace blower motor. Newer high efficient motors, such as X13 and ECM motors, have end caps that control the motor speeds. These can be removed and replaced separately. Replaces Old Part #s. Partial List of Units that Use This Item. Hit Ctrl + F and enter your model number for a quick search!