Fan blower has a raised section in the base body, near the under side of the rotating fan blades, increasing the air volume drawn in to be impelled by the fan wheel

摘要

The fan blower has a fan wheel (22) with a hub (221) and blades (222) around the circumference. A frame (21) has a base body (211) and a cover (212). The inner side (211a) of the body forms a raised section (211b) near the under side (222a) of the fan blades.