| 摘要 |
PURPOSE: A hood system is provided to be able to reach the strength of the wind curtain to remote position from a diffuser as possible and to improve the suction performance of a hood by installing a spiral blade to an inlet and the diffuser and revolving the blowing air. CONSTITUTION: The hood system is composed of:an inlet(10) having a diffuser(11) around, connected to a suction fan(12) which is connected to a filter(13); the diffuser(11) blowing air downwards; the filter(13) connected to the diffuser(11) installed around the inlet(10) so the purified air from the filter(13) as to blow through the diffuser(11); and a spiral blade(14) installed inside of the diffuser(11) so the strength of a wind curtain as to reach the remote position from the diffuser(11) by revolving the blowing air.
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