PROBLEM TO BE SOLVED: To provide a centrifugal fan with reduced propagation of noise.;SOLUTION: The centrifugal fan with reduced noise consists of an outer shell, a fan wheel, and a projection and depression member. The fan wheel is provided with a wheel and a plurality of blades extending radially outward along a wheel outer circumference. A space storing the fan wheel is provided inside of the outer shell and the projection and depression member is provided on an outer shell surface. The projection and depression member consists of a combination of at least one projection part and at least one depression part. Propagation of noise is reduced by the projection and depression member.;COPYRIGHT: (C)2007,JPO&INPIT
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