An air conditioner is provided with two air outlets, a plate assembly (2) for opening and closing each air outlet is provided at each of the two air outlets, and the plate is propelled to open and close in a propelling manner with a gear (4c) and a rack (4b), to prevent dust from entering the inside of the air conditioner. The plate assembly (2) is connected to a propelling mechanism (4) by clamping, so that the plate is easily disassembled to maintain and repair the air conditioner.
