Major types are centrifugal blower and positive-displacement blower.\r\r\nCentrifugal blowers look more like centrifugal pumps than fans. The impeller is typically gear-driven and rotates as fast as 2900 rpm. In multi-stage blowers, air is accelerated as it passes through each impeller.\r\n\r\nIn single-stage blower, air does not take many turns, and hence it is more efficient. Centrifugal blowers can achieve higher pressures up to 1500 mmWC\r\n\r\nTypes, characteristics and applications id of centrifugal blower

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