... can be used for ceiling, interior decoration, decoration, platform aisle, ventilation windows, (Wells), advertising plaque and other construction.Materials:Mild carbon ... capacity and can save materials and cost. It offers good ventilation of light and wind, a modern sense, aesthetic appearance ... )ASTM(A36)ASTM(A123)BritainBS4592-1995BS4360(43A )BS729AustraliaAS1657-1992AS3679AS1650 ventilation grates