这好像是测量漏风率（在试验室内）的标准.
rough opening 是一个简单,不是很准确的开口.
试样的面积(A), 平方米（平方英尺） - 面积是由能纳入粗略开口的框架的整体尺寸确定.
英语翻译ASTM-E283中的术语定义specimen area (A),m2 (ft2)—the area deter
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