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RadiCal centrifugal fan with aerodynamically optimized scroll housing is used in central home ventilation units. The scroll housing with its round exhaust opening connects directly to the pipe fitting on the ventilation unit’s outlet, considerably reducing the usual flow losses while the air performance remains very pressure-insensitive and the efficiency increases by up to 34% compared to centrifugal blowers of the same construction. In addition, the noise level is reduced by 3.5 dB(A), as already confirmed in numerous tests. Installation-induced noises that arise during operation and are undesirable in living areas can also be reduced.