本文件规定了天然和机械通风中使用的整流罩和屋顶出口的空气动力学和声学特性的测量方法。只有安装在屋顶表面上方的导管上的整流罩和屋顶插座才符合本标准。 关于辅助车罩，只有风扇辅助车罩被本标准所覆盖，其他类型（如注射辅助车罩）暂时不能充分考虑。 本标准的范围不包括辅助罩的辅助风扇提供的“辅助”性能测试

This document specifies methods for measuring: - the aerodynamic characteristics of cowls, fan assisted cowls and roof outlets; - the electrical and acoustic characteristics of fan assisted cowls. This document is applicable to cowls, assisted cowls and roof outlets used in natural, hybrid or mechanical ventilation and that are meant to be fitted onto ducts which project above the roof surface. This document does not apply to: - assisted cowls assisted by a device other than a fan (e.g. injection assisted cowls); - roof exhaust fans (see EN 13141-4).