| 摘要 |
An air impeller or circumferential fan includes one or more fan blades disposed between first and second plates. The first plate is tapered with respect to the second plate and includes an orifice that allows air to flow through the first plate and past the fan blades. The first plate also includes a circumferential ridge located away from the orifice which provides for more consistent construction of the first plate and, therefore, cheaper manufacturing of the air impeller.
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