Guide plate part for plug fan in air conditioner

[Problem] To provide a compact guide plate part and plug fan chamber without reducing efficiency when an ideal Archimedes curve is used in the guide plate part of a plug fan. [Solution] A guide plate part on the blowing side of a plug fan of an air conditioner in which the rotary shaft of the plug fan is directly coupled to the rotary shaft of the drive motor, wherein the shape of the guide plate part is such that, in comparison to an ideal Archimedes curve, the entire guide plate part on the left/right sides is narrowed to a prescribed width, and the entire lower-end portion is dropped downward to a prescribed width, thereby producing a revised Archimedes curve.