Patent ID: 6880516

Claim:
An intake system for preparing combustion air for an internal combustion engine of a portable handheld work apparatus, the intake system comprising: a carburetor having an intake channel defining an intake opening; an air filter mounted upstream of said carburetor; a filter case surrounding said air filter and having an inlet opening; a cooling air fan unit of the engine for generating a flow of cooling air; a combustion air channel having a take-up inlet in said cooling air fan unit; said combustion air channel extending to said inlet opening of said filter case; said filter case having an inner space and having ventilation opening means for connecting said inner space to the ambient air; and, said ventilation opening means having a flow cross section so dimensioned that the air flows through said inlet opening, said intake opening of said carburetor and said ventilation opening means are balanced at rated rpm of said engine and that a uniform pressure level adjusts in said inner space of said filter case.