Patent ID: 6948457

Claim:
A fan arrangement of an internal combustion engine including an engine of a portal handheld work apparatus, the fan arrangement comprising: a fan wheel for acting on air containing entrained dirt particles so as to move said air in an air flow along a flow path; said fan wheel defining a rotational axis; a fan housing at least partially surrounding said fan wheel; an aerodynamically formed guide ramp disposed outside of said fan wheel in radial direction and said guide ramp being formed so as to rise in the direction of said rotational axis with the course of said air flow so as to deflect a first component of said air flow together with said dirt particles in the direction of said rotational axis; and, a take-out opening disposed downstream of said guide ramp in the region of said air flow to branch off a second component of said air flow as a combustion air flow for said internal combustion engine substantially free of said dirt particles.