本文档提供了一种方法，可以根据窗户的性能对其进行分类 在适当情况下，抵抗货架载荷、静态扭转及其手动操作力的强度。 不包括防盗等特殊方面。1） 购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document provides a means of classifying the performance of opening windows according to their strength in resisting, where appropriate, racking load, static torsion and their manual operating forces. Special aspects such as those of burglar resistance are not covered.1)All current amendments available at time of purchase are included with the purchase of this document.