| 摘要 |
PURPOSE:To prevent the occurrence of dew condensation on an outer case by providing the covering parts having heat insulating property for covering the inner peripheral parts of air holes of the outer case. CONSTITUTION:An outer case 11 is made of steel plate in the form of a rectangular case with an opening in its lower surface and is mounted to ceiling board. The air inlet opening 21b of an air inlet casing 21 is provided around its outer peripheral edge with a covering part 32 projecting to the amount corresponding to the plate thickness of the outer case 11. The air exhaust opening 30 of a supporting body 19 is also provided around its outer peripheral edge with a covering part 33 projecting to the amount corresponding to the plate thickness of the (4) outer case 11. The covering part 32 of the air inlet casing 21 is engaged with the air inlet opening 13 of the outer case 11 to cover its inner peripheral part 13a. The covering part 33 of the supporting body 19 is also inserted into the air exhaust opening 14 of the outer case 11 to cover its inner peripheral part 14a. Since in this way the inner peripheral parts 13a and 14a are covered with their respective heat insulating covering members 32 and 33, the transmission of heat to the outer case 11 can be lessened to prevent the occurrence of dew condensation thereon. |
