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An enclosed cyclone passageway (ECP) dust-collecting fan is discussed. The ECP fan separates dust by centrifugal force originating from a driven spiral airflow, and its design takes the constraints of Chinese underground coal mines into consideration. Using the force equilibrium law, a general equation for dust removal in the centrifugal dust removal section (CDRS) of the ECP fan is deduced. This general equation is simplified using the CDRS structure and the fan operating parameters and is analysed numerically. The attractive results show that increases in the airflow rate of the fan, the structural ratio of the ECPs and the radius of the extended axis can improve the dust removal performance of the CDRS. Furthermore, the effects of the structural ratio and the radius on dust removal dominate over that of the flow rate, and the effect of the structural ratio is more significant than that of the radius.