本文件规定了测量方法: -整流罩、风扇辅助整流罩和车顶出风口的空气动力学特性；-风扇辅助整流罩的电气和声学特性。 本文件适用于自然通风、混合通风或通风系统中使用的整流罩、辅助整流罩和车顶出风口 机械通风和通风系统应安装在突出屋顶表面的管道上。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 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.All current amendments available at time of purchase are included with the purchase of this document.