Ventilator wheel and ventilator

A ventilator wheel comprising:

• a bottom disk and a plurality of ventilator blades arranged and distributed about an axial axis of rotation on the bottom disk, whose axial height dimension runs between an intake side and the bottom disk, wherein the bottom disk has a body with a flat section and a circumferential radial outer rim section which runs at least for a portion as a curved shape, looking in the cross section, and thereby forms an elliptical transition of the bottom disk from a radial extension to an axial extension, the bottom disk includes a hub spaced from the flat section, the hub projects away from the intake side and away from the ventilation blades in the direction from the intake side to the bottom disk, the hub includes an axial step connecting the hub with the body, the axial step is in the center region lying outside the axis of rotation, the axial step is Z-shaped, in cross section, with a web extending partly in the radial and axial direction, the web runs at an angle of 20 to 60 degrees with respect to the radial direction of the ventilator wheel, the hub in alignment with the axial extension of the curved shape outer rim section, the ventilator blades having a radial outer edge, each forming a transition point on a side with the bottom disk, and an imaginary ring joining the transition points in the circumferential direction forms a boundary line for the flat section, to which the elliptical transition of the bottom disk is adjacent immediately or with a spacing in the radial direction.