| 摘要 |
PURPOSE: A device for automatically opening/closing a door of an air duct is provided to carry out the opening and closing of a door automatically by the air pressure introduced from the outside into the air duct case. CONSTITUTION: In a device for automatically opening/closing a door of an air duct, a door(20) includes a main body, and a rotation bar(21) integrally formed at a lower end of the main body to be fitted in an air duct case(10). The rotation bar is supported by the case rotatably in the vertical direction by introduced air pressure. The air duct case includes a stopper(11) formed on an inner wall surface of the case for stopping an end of the door for limiting an opening area of the door, and a discharge hole(30) for discharging air flowing via the opening area of the door to the outside, thereby automatically opening or closing the door.
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