| 摘要 |
Fan which comprises a helicocentrifugal runner (wheel) 12- 13 and whose tubular surround or casing 1 has on its inner surface a frustoconical region 20 which with minimum play encircles the imaginary frustoconical surface on which there are the free edges 14 of the blades 13 of said runner, whilst the independent body which defines the inlet mouth 2 of the fan has an internal cylindrical surface 25 which is located as an extension of the aforesaid frustoconical region. <IMAGE>
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