Roof ventilator used in cafes and offices comprises a rotor contained in a housing which is rotates on an axle via two ball bearings made from plastic arranged at an axial distance from each other

摘要

Roof ventilator comprises a rotor (4) contained in a housing (6) which is rotates on an axle via two ball bearings (2) made from plastic arranged at an axial distance from each other. Preferred Features: A bearing ring (2.1) is provided and has a recess into which a corresponding protrusion of a further bearing ring fits. A stator (3) is arranged on the axle between the ball bearings and is concentrically enclosed by the rotor.