| 摘要 |
1,192,728. Lamps; ventilating. H. T. CEILINGS Ltd. 2 April, 1969, No. 17182/69. Addition to 1,160,316. Headings F4R and F4V. In a lighting fitting according to the parent Specification holes 11 are formed in the outwardly extending flanges 8 of the side members 2 to permit air to pass therethrough. The air flow may be regulated by a slidable valve strip 12 shaped to provide downwardly directed ducts below each hole. Enclosed plenum chambers may be formed above each flange. |
