| 摘要 |
PROBLEM TO BE SOLVED: To improve an air cooling function of an exhaust fan device. SOLUTION: The exhaust fan device has a casing 11, a motor 12, a fan 13, a return pipe 14, and a nozzle 15. The return pipe 14 is connected in the middle of an exhaust passage part 11b of the casing 11, and is branched from the exhaust passage part 11b and is extended downward. Part of air fed to the exhaust passage part 11b by the fan 13 flows into the return pipe 14, and a nozzle 15 jets the air toward an object to be cooled, as shown by an arrow 22. COPYRIGHT: (C)2007,JPO&INPIT
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