| 摘要 |
PURPOSE:To reduce the size of take-in device without sacrifice of performance, by opening/closing the upper outer air port of inner/outer air exchange box and one of said wall inner air port alternatively by means of telescopable folding door body and folding door body while remaining three ports by means of a diaphragm door body. CONSTITUTION:Opening/closing function of diaphragm door body 26 and folding door body 22 are interlocked through an interlocking member and when said door body 26 will close the inner air take-in ports 5, 5A, 5B, the inner air take- in port 4 is also closed by means of door 23 of said door body 22 to such only outer air through fan suction port 3. Upon opening of diaphragm door body 26, said door 23 is also opened while said port 2 is closed by the doors 23, 24 to open said ports 4, 5, 5A, 5B thus to suck only inner air through fan suction port 3. In such a manner, inner air take-in port in remaining three faces of side wall are opened/closed to increase the area of inner air take-in port even if the height of exchange box is lowered resulting in reduction of said without sacrifice of air take-in performance. |
