A cyclonic separator assembly for use with a vacuum cleaner includes a body having an inlet, an outlet, and an inner surface. The cyclonic separator assembly also includes a cyclone unit positioned within the body between the inlet and the outlet. The cyclone unit has an outer perimeter that is spaced apart from the inner surface of the body to define an inlet space therebetween. The cyclone unit includes a plurality of first cyclones in communication with the inlet space and arranged along an outer circle adjacent the outer perimeter. The cyclone unit also includes a plurality of second cyclones in communication with the inlet space and arranged along an inner circle that is spaced apart from the outer circle such that each second cyclone is nested between two adjacent first cyclones. The plurality of first cyclones and the plurality of second cyclones are arranged in parallel.