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This paper follows a previous paper in which the flow rate characteristics of a filter fan for an air cleaner was reported. This paper is concerned with filtration performance as well as with sound level performance. Filtration efficiency, which is defined as the ratio of floating particles in air to captured particles by the filter fan, becomes higher as the diameter ratio becomes smaller. The maximum filtration efficiency is 90% in the cases of a radial filter profile with a diameter ratio of 0.35 and an inclined backward profile with a diameter ratio of 0.50. According to the previous paper, the largest flow rate generated in the case of a diameter ratio of 0.50. Then, the sound pressure levels are investigated in three cases of filter profiles at a diameter ratio of 0.50, i.e., a radial profile, an inclined forward profile, and an inclined backward profile. In conclusion, the best profile of the filter fan has an inclined backward filter profile and a diameter ratio of 0.50.

Development of Filter Fan Impeller with both Functions of Fan and Filter (Effect of Impeller Profile on Filtration and Noise)