This is a New, Lennox 1/3HP, 4-speed, OEM furnace blower motor. THIS IS NOT AN AFTERMARKET GENERIC REPLACEMENT MOTOR. Lennox part # 60L21, 60L2101. Emerson/US Motors part # K55HXHFZ-8638. This motor has 3 legs and replaces motors with 4 legs. REPLACES: 60L21 29W71 21W85 45H31 18M26 79A52 21L92 89C36 86G45 83A13 57C25 45H69 37J25 89C3601 57C2501 45H6901 100649-11 100649-01 79A5201 60L2101 45H3101 37J2501 21L9201 18M2601. If you need this motor, you probably need it fast.