| 摘要 |
PROBLEM TO BE SOLVED: To prevent reduction in the static pressure and increase in the noise level when a fan is normally rotated by arranging in a fan casing a door with the same curvature as that of a boundary part to selectively open/close an opening part formed in the boundary part between a scroll part and a nose part. SOLUTION: An indoor side fan casing 43 comprises a scroll part 45 and a nose part 46, and an opening part 49 is formed in a boundary part between the scroll part 45 and the nose part 46. The opening part 49 is selectively opened/closed by a door 51 arranged in the indoor side fan casing 43. The curvature of the door 51 is same as that of the boundary part between the scroll part 45 and the nose part 46, and when the door 51 is at the position to close the opening part 49, the door 51 is installed so that the door constitutes a part of the scroll part. Reduction of the static pressure and increase in the noise level can be prevented when a fan 42 is normally rotated. |
