| 摘要 |
PROBLEM TO BE SOLVED: To contrive reduction of the cost and assembly man-hours in a duct structure of a cold room. SOLUTION: Reduction of the costs and assembly man-hours are enabled by forming a cold air delivering route 53 by edge expansion parts of a duct board 54 made of expanded polystyrene having an approximately U-shaped section being fitted and fixed to an undercut-shaped recess 55 formed on an inner box 23 and having a simple air duct constitution without seal parts and duct board-fixing parts. |
