Comparison : Item # 140651, 5 HP Blower Assembly
Item # 549403, Assembly, complete (230-460V, 60 Hz, 3 phase)
Item # 549963, Motor only (230-460V, 60 Hz, 3 phase)
Item # 753041, Impeller only, (old style) 14"
Item # 753051, Impeller only, (current) 16 1/2"