PURPOSE: To satisfactorily maintain the efficiency of sending air in a desired direction by a method wherein rotating pins of second louvers are located in front and in rear of a rotating pin of a first louver, and the rotation of the rotating pin of the first louver is transmitted to the pins of the second louvers so that the second louvers are turned in the same direction of the same angle as those of the first louver.
CONSTITUTION: When a middle horizontal louver 29 is turned clockwise, for example, by operating an operating knob, a gear 55 turns together with the middle horizontal louver 29, and the rotation is transmitted to gears 51 - 54 through gears 56 - 59. Thereby, the gears 51 - 54 tend to rotate in the same direction for the same angle as those of the gear 55. On the contrary, the middle horizontal louver 29 is turned anticlockwise, an upper horizontal louver 28 is turned around a pin 283, and a lower horizontal louver 30 is turned around a pin 302. Therefore, turning the middle horizontal louver 29 causes the upper and lower horizontal louvers to turn in the same direction for the same angle, so that the louvers can be tilted to adjust the air flow direction while they remain in parallel.