So, for the fire rating for vertical components of these buildings, and using the high rise code provisions under four hundred feet, we know that we have to achieve a three-hour rating for the columns.
因此,对于这些建筑物的垂直构件的防火等级,并使用四百英尺以下的高层建筑规范规定, 我们知道我们必须达到这些柱子的三小时防火等级。