Electrical hand tool with magnets for absorbing dust

An electrical hand tool device of the type having a motor, said device comprising:

• a ventilated housing having an interior within which the motor is located so as to be exposed to an air flow along a flow path for cooling the motor, said flow path including at least one air inlet opening through which air of said air flow may enter said interior of said housing and at least one air outlet opening through which air of said air flow may exit said interior of said housing;
• at least two magnets which are separated from one another by at least one gap and are disposed within said housing to form a magnetic field extending across said flow path at a location located downstream of said inlet opening and upstream of the motor for collecting magnetically attractable particles from said air flow to prevent said particles from reaching the motor, said magnets being disposed such that all of said air flow passing through said flow path must pass between said magnets and through said magnetic field before reaching the motor;
• and
• means, cooperating with said at least two magnets, for determining whether a substantial amount of said particles has been collected by said magnets and for initiating at least one of:
• (i) an optically perceivable indication, (ii) an acoustically perceivable indication and (iii) de-energizing the motor.