Most of the current studies on the modification of geometricalparameters of centrifugal fans deal with aerodynamic performanceproblems. Generally, centrifugal fan is not used as separationequipment for its low separation efficiency of grease particles.Although rotary filters separate grease particles with high efficiency,they are easily blocked. This leads to grease particlesrelease into rooms and it causes unpleasant for chef as well asoccupants. In addition, GB/T 17713-2011 mandates a minimumgrease separation efficiency of 80% for range hoods. Therefore, itis necessary to develop a new range hood that can meet exhaustairflow requirements and exhibit a high grease separation performanceas well.