| 摘要 |
This fan 1 consists of a stack of at least two units 2, 3 consisting of two circular concentric end flanges 6, 7 and 12, 13 joined together by blades (vanes) 11, 20 of suitable curvature arranged in parallel with respect to the flow of air, the air being sucked in by a first unit 2 and the shaft of the motor 5 being fixed to the unit 3 which is furthest away from this first suction unit. <IMAGE>
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