The air duct exit which possesses the return air duct which promotes the air flow which shakes

摘要

The 1st side wall where the air duct exit after alienating, with in order the wall and the lower wall and picture forming to do the air duct which possesses the entrance and the exit, extending is present between the upper wall and the lower wall and alienates and the 2nd side wall it has the housing which possesses. The 1st air return passage while being arranged, with the 1st side wall, to the 1st side wall it adjoins coming in contact inside the air duct the point where it detours the portion of the air flow which flows it has reached. The 2nd air return passage while being arranged, with the 2nd side wall, to the 2nd side wall it adjoins coming in contact inside the air duct the point where it detours the portion of the air flow which flows it has reached. Inside the air duct by the 1st and 2nd air return passage continual detour of portion of the air flow which flows, means to make the shaking sweep motion of the air flow cause which leaves the air duct exit.