| 摘要 |
A fan provided with a smoke detector wired to a CPU in a switch to start the fan if smoke detected exceeds a certain level; and an ion generator is provided to generate ions to neutralize substances carrying hazardous cations; a first conductor on a screen holder wired to the CPU and in off-position state is conducted by contacting a second conductor provided on a front screen so that the fan blades are disabled when both conductors are disconnected once the front screen is removed.
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