US Patent 8393320 Blower motor with flexible support sleeve

A double-ended blower includes a blower motor assembly supporting opposed first and second shaft ends. The first and second shaft ends have respective first and second impellers attached thereto and enclosed within first and second volutes, respectively. The first volute is connected to an inlet and the second volute is connected to an outlet. The blower motor assembly is at least partially enclosed within a flexible sleeve, with a radially outer inter-stage gas path extending between the first and second volute, and radially inward of the flexible sleeve.