Part Number Breakdown:

Example: ECFA14G172S31

EC = Energy Saving Motor, F = RPM (F = 4pole, T = 2pole), A = Assembly, 14 = Power (watts), G = G = Grid / R = ring mounting, 172 = Size of Blade (mm), S = Airflow Direction (S = sucking or B = blowing), 31 = Degree of the blade.