Frameless DC fan is the fluid that frameless DC fan through the fan impeller twice, the fluid flows in the radial direction and then frameless DC fan out in the radial direction.

A cross-flow fan is a fluid that cross-flow fan through the fan impeller twice, the fluid flows in the radial direction and then flows out in the radial direction. The intake and exhaust directions are in the same plane

Ein Cross-Flow-Lüfter ist eine Flüssigkeit, die zweimal durch das Lüfterlüppchen lüftet. Der Flüssigkeit fließt in radialer Richtung und fließt dann in radialer Richtung heraus. Die Einlass- und Auspuffanleitung befinden sich in derselben Ebene

A cross-flow fan is a fluid that cross-flow fan through the fan impeller twice, the fluid flows in the radial direction and then flows out in the radial direction. The intake and exhaust directions are in the same plane