| 摘要 |
A unit main body (1) has a front suction port (3) and upper suction port (2). An air filter (15) is detachably attached to the inner surface of the unit main body (1) to oppose the front suction port (3) and upper suction port (2). The air filter (15) includes a pleated filter member (17) folded in a zigzag manner and having pleats, a crosspiece member (18) formed at a side end of the pleated filter member (17) along the pleats, and a frame member (20) formed across tops of the pleats on one side of the crosspiece member (18), thus forming a flexible air filter. |
