| 摘要 |
Disclosed is a rotational speed adjustment device or switch that is provided in a corner screw hole at a front or back of a heat dissipating fan frame, the rotational speed adjustment device or switch being electrically connected to a power source of the fan by means of a power cord or other conductive metals, the adjustment device or switch being extended with a knob that is individually exposed out of the fan frame, the heat dissipating fan may be installed in any space that requires heat dissipation or to an outer periphery of a unit casing, to allow a user to adjust rotational speed of the heat dissipating fan at one's desire at any time.
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