| 摘要 |
PROBLEM TO BE SOLVED: To reduce an air blowing resistance and improve a performance of air blowing operation without damaging a design characteristic by a method wherein some openings arranged at a cover in a certain regularity and a rate of each of the openings occupied per unit area is specified. SOLUTION: There is provided a suction segment communicated with an air blowing passage at a front surface of a casing having the air blowing passage in which a filter 11, a heat exchanger 10 and an air blower fan 16 are arranged in it in sequence. This suction segment is provided with a cover 8 for covering the filter 11. Then, this cover 8 is formed to have a smaller wall thickness than that of a casing 4 having a suction segment therein. In addition, this cover 8 is formed with a plurality of openings arranged in a certain regularity. In addition, the plurality of openings are arranged in a certain regularity as one group, thereby a rate of opening can be increased while an ornamental characteristic is increased and an entire strength of the device can be increased. Further, if the rate of opening is in a range of 50 to 70%, it is possible to cause its inner side to be hardly seen so as to improve its design characteristic. |
