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Single stage blowers are constant speed, rotating machines. Air flows through single stage blowers are controlled by guide veins, either by a single set of inlet guide veins or by two sets of guide veins. A dual vein, single stage blower, uses two sets of veins, one on the inlet side and one on the outlet side. So they cost a bit more initially, but this design is more efficient. The outlet guide veins are used to control the aerodynamic shape or flow pattern of air as it is released from the tip of the impeller. So they control the air flow through the blower.