| 摘要 |
A cabinet of essentially rectangular box-like configuration comprises walls and a ceiling and floor which are of composite construction and which comprise an outer steel plate (1), a concrete layer (2), a cellular plastic layer (3), and a board or steel-plate lining (4) in that order. Provided in at least two mutually opposing walls is a respective ventilation opening (6) which can be closed sealingly by an opening closure member (6a, 6b). The closure member (6a, 6b) is held in a given spaced relationship with its respective opening by means of a holding arrangement which in normal prevailing temperature conditions is operative to maintain the closure member in its spaced relationship with the ventilation opening but which when the ambient temperature exceeds a given level is automatically activated to cause the closure member to sealingly close its respective ventilation opening. |
