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A centrifugal air blower unit includes a casing comprising two separable sections which enclose a centrifugal impeller. The impeller has a hub including a threaded bore for attaching the impeller to the distal end of a drive shaft extending from a support of a portable power unit. The casing is adap

A centrifugal air blower unit includes a casing comprising two separable sections which enclose a centrifugal impeller. The impeller has a hub including a threaded bore for attaching the impeller to the distal end of a drive shaft extending from a support of a portable power unit. The casing is adapted to mount on a support housing for the drive shaft. The hub of the impeller includes a portion extending in a direction opposite to the threaded portion and through an opening in the bottom wall of the casing whereby the impeller may be threaded onto and off of the drive shaft for connecting and disconnecting the blower unit to the bearing housing without disassembly of the casing. The casing includes a mounting pad formed integral with one of the casing parts and supported by a plurality of spaced apart radially projecting webs forming an air inlet opening and also forming combination inlet guide vanes and a trash guard for the impeller.

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An air blower for attachment to a portable power supply unit including a prime mover, a support, and a drive shaft mounted on said support, said air blower comprising: a casing including first and second separable parts, a generally upward facing air inlet opening formed in a top wall of said first

An air blower for attachment to a portable power supply unit including a prime mover, a support, and a drive shaft mounted on said support, said air blower comprising: a casing including first and second separable parts, a generally upward facing air inlet opening formed in a top wall of said first part of said casing, a bottom wall formed on said second part of said casing spaced from said top wall and defining an air flow passage between said walls, and a generally horizontal air discharge nozzle in said casing in communication with said passage for directing a relatively high velocity air stream away from said casing; a mounting surface formed on said casing for removably mounting said casing on said support; an impeller disposed within said casing, said impeller having a hub including means for removably mounting said impeller on said drive shaft in driven engagement with said drive shaft; and means on said impeller for connecting said impeller to said drive shaft and removing said impeller from said drive shaft without disassembling said casing.