| 摘要 |
PROBLEM TO BE SOLVED: To detach or attach a filter in a narrow space, to reduce the filter manufacturing cost and to increase the ventilating area. SOLUTION: A guide 130 for conducting a filter 30 to a specified assembling position from an opening 120 is curved in the air flow D direction and formed in a case 101, and the filter 30 is curved in the air flow D direction. Consequently, the filter 30 is pulled out along the curved guide 130, further the filter 30 is curved with a curvature larger than that of the guide 130 and pulled out, and the filter 30 is detached or attached even in a small space. Besides, since the filter 30 need not be divided, the manufacturing cost is reduced, and the ventilating area of the filter 30 is increased.
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