| 摘要 |
PURPOSE:To facilitate an operation of fitting on a support edge and also operations of positioning on the occasion of fitting and of maintenance by a construction wherein a flange to be set in superposition on the support edge is provided integrally in the middle of the trunk part of an outer casing. CONSTITUTION:When a trunk part 2b is lowered into a rectangular frame composed of opposite support edges 5 from above the frame on the occasion of fitting of an outer casing 2, a flange 2c provided on the trunk part 2b abuts on the upper surface of each support edge 5. Thereby the outer casing 2 is held at that position and does not drop even when an operator unhands the casing. A flange 7 for connecting a duct is positioned above each support edge 5, and therefore it does not hinder the fitting of the outer casing 2. Since the lower opening of the outer casing 2 projects downward from the lower side of each support edge 5, in addition, the positioning of the outer casing 2 and a subsequent operation of fitting a front decorative plate and the like can be facilitated as well. |
