●AC fans with external rotor shaded-pole motor. Impedance protected against overloading. ●Metal fan housing and impeller ●Air intake over struts. Direction of rotation clockwise, seen on rotor. Types 4890 N and 4840 N air exhaust over struts. ●Electrical connection via 2 flat plugs 3.0 x 0.5 mm. ●Impeller with 3 or 5 blades, see note for fan type. ●Optionally available: Models with reinforced flanges and single leads. ●Fan housing with grounding lug for screw M 4 and UNC. ●Mass: 550 g. ●Please note our new ACmaxx Series. With identical mounting dimensions and voltages, this Series achieves higher energy efficiency.