The upstream end of the fire test chamber shall be filled with a 14in . length of uncoated 16 - guage steel plate positioned on the specimen mounting ledge in front of and under the leading edge of the specimen 前缘燃烧测试室上游端口中是一长14英寸厚度规格为16的无镀层钢板，该板位于样品安装壁架前端，在样品前缘下方。
