An appliance housing for a canister vacuum cleaner having an interior divided into a motor fan chamber and a dust collection chamber includes a flat, upwardly open receiving shell. Batches of silicone hydrogel contact lenses and methods of making silicone hydrogel contact lenses are also described. Two relaying paths can occur simultaneously in at least one time slot whereby they are in disjunction to one another. The assembly may include a pressure-bearing housing positioned external to the wall. Each connector includes offset engagement members that mate with corresponding engagement members on the midplane circuit board. The X and Y values are distances, which when smoothly connected by an appropriate continuing curve, define airfoil profile sections at each distance Z.