A centrifugal fan for a refrigerator can include a plurality of vanes arranged radially about a central a shaft; a ring-shaped shroud coupled to the vanes and having a curved portion with a predetermined radius or curvature and also having an angled portion with a predetermined gradient or angle relative to the curved portion; and a bottom surface coupled to the vanes on the side opposite the shroud; where a ratio (r/R) of an inner diameter r, which is the shortest distance between the vane and the shaft, and an outer diameter R, which is the longest distance between the vane and the shaft, is approximately 0.69±0.01.