| 摘要 |
In an axial fan, which is accommodated inside a square cylindrical space which is delimited by two square flanges 40, 41, a ring 12 is put onto the rotor 10 of the drive motor 4, which ring has an outer surface 13 which widens conically in the flow direction according to arrow 14. This outer surface delimits the flow duct 14 inwardly and causes an increase in the fan pressure (Figure 3). <IMAGE>
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