Jigsaw connector pieces representing tasks to be performed are displayed on a computer screen, preferably hierarchically in a tree, to elucidate the relationships between tasks. The apparatus also includes a first base member extending from the first elongated body, wherein the first base member is attachable to the motherboard and a first pivot portion extending from the first elongated body, wherein the first pivot portion is angled upward toward an interior side of the first bracket. Projections 29 on the commutator mate with recesses in the fan 20 to prevent relative rotational movement and detents including resilient fingers 23 and projection surfaces 34 hold the fan axially. Each of the second cyclones is disposed so that longitudinal axes thereof are substantially vertically arranged.