| 摘要 |
A radiation device of a fan includes a fan blade assembly, a fan base attached to the fan blade assembly and a motor unit attached to the fan base. The fan blade assembly has a fan blade hub with at least a slant at the circumference thereof and an air opening and a flow passage being formed with the slant corresponding to the fan base such that part of fluid driven by the fan can be guided into the fan blade hub to cool the motor unit so as to prolong life span of the entire fan.
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