| 摘要 |
The device has an air outlet duct (6) with a set of openings (14) for air passage. Inclined walls (16) are placed in front of each opening. The walls have openings (18) at their free ends, where the openings (18) are in connection with the openings (14) by a free edge. The walls have lateral sides (20) taking support on the duct to avoid penetration of particles into the openings (14) while passing beside the walls. |
