| 摘要 |
PURPOSE: To effectively suck dirty air corresponding to the installing place of the desk or the position of a smoker with simple structure. CONSTITUTION: A small top plate 8 is fitted to a pair of supporters 7 erected at the side edges of a sucking port 3 by concentrically extended screws 9. By changing the attitude of the small top plate 8 by unfastening the screws 9, switching is enabled such as concentrated suction only from one side with the small top plate 8 between or equal suction from both the sides of the small top plate 8. |
