A double-ended blower comprises a blower motor assembly (M) supporting opposed first (258) and second (260) shaft ends, the first (258) and second (260) shaft ends having respective first (244) and second (248) impellers attached thereto and enclosed within first (247) and second (251) volutes, respectively, wherein the first volute (247) is connected to an inlet (264) and the second volute (251) is connected to an outlet (276). The blower motor assembly (M) at least partially enclosed within a flexible sleeve (272), with a radially outer inter-stage gas path extending between the first (247) and second (251) volute, and radially inward of the flexible sleeve (272).
