Controlled noise portable power unit for operating a tool

摘要

A portable power unit for operating a tool is provided and includes a frame adapted to be carried on the back of an operator to orient the power unit in a the predetermined operating position with the operator standing upright. The power unit further includes an engine mounted on the frame for powering a tool, a fan mounted between the frame and the engine, a fan intake positioned between the frame and the fan, and structure for attenuating engine and fan generated noise and for inhibiting the emanation of engine and fan generated noise in horizontal directions from the power unit with the power unit in the operating position.