| 摘要 |
PROBLEM TO BE SOLVED: To make the replacement of a filter unit safe and permit air-tightness, retained between the filter unit and a partitioning part for a long period of time, by a method wherein an elastic body is provided between the suction side of a fan and the filter unit while a fixing means, fixing detachably the filter unit, is provided integrally with a main body casing. SOLUTION: A fan 8 for suction air is attached to the downstream side of a bell mouth 6 and an elastic body 9 is bonded along the inner periphery of a wall body 7. A filter 10 is mounted so as to be abutted against the elastic body 9 in the wall body 7 and, further, the front surface opened part of the main body 1 is covered by a front grille 11. Upon replacing the filter 10, the lower parts of left and right projections 18 on a filter frame body 17 are pushed to force hooking units outward and spread retaining pieces 13 while retaining the filter 10 so as to pinch the same, the filter 10 can be pulled out to this side. In this case, the front grille 11 can be attached to or detached from the main body casing 1 by providing the grille 11 with recesses and projections, which can be engaged with the main body easing 1 mutually. |
