A ventilator includes a multi-wing fan deposited inside a chamber body, and a joint which connects to the outlet of the multi-wing fan.

The invention relates to a fan comprising fan blades, especially for a cooler of a motor vehicle, said fan blades (2) being fixed to a fan hub (3).

An impeller (3) in a multi-blade fan has a plurality of centrifugal blades (11).

A fan with illuminated blades (9) for displaying pictoral elements (19) on exposed faces of the blades.

The suction producing mechanism is preferably a propeller blade fan.

The fan with illuminated blades may be utilized to display static or animated messages.

Air turnover in a space achieved by a paddle fan having a plurality of blades is significantly increased by mounting an assembly radially outward from the blades.

To make manifest the above noted desire, a revelation of the present invention is brought forth.

The fan may be a screw or radial fan (17a, 17b) and the direction of the gas flow can be altered by reversing the direction of rotation of the fan.

The multi-blade fan has the cutouts (17) in the outer end (15a) of each blade (15).

A multi-blade fan having improved noise performance and air delivery performance.

A multi-blade fan having cutouts in the outer end of each blade and producing increased fan pressure.