如今，管道风机和非管道风机的声音测量主要在混响室进行。对于这两种类型的设备，部分基于通用ASHRAE标准36-62的美国空调协会（AMCA）标准（公告3001965）适用。根据该标准，管道设备应完全放置在房间内，与任何墙壁的最小距离为3英尺，管道和房间之间的耦合效应应通过修正系数予以考虑。从经济角度来看，为了消除耦合问题，显然需要直接在管道中进行测量。因此，在过去15年中，几名调查人员致力于研究这一问题并不令人惊讶- 管道试验方法。参考文献1至13描述了一些最近的调查。由于英国的努力，英国标准协会于1966年向国际标准组织提交了一份提案，其中包括管道内声音测量方法。然而，仍然存在一些问题，我们当前研究的目的是为编写改进的管道内标准提供额外的知识。引文:美国密苏里州堪萨斯城ASHRAE学报第76卷第2部分

Sound measurements on both ducted and non-ducted fans today are made mainly in reverberant rooms. For both types of devices the standard of Air Moving and Conditioning Association (AMCA) (Bulletin 300, 1965), which is based partly on the generic ASHRAE Standard 36-62, is applicable. According to the Standard, ducted devices are to be placed entirely within the room at a minimum distance of 3 ft from any wall and coupling effects between the duct and the room are to be taken into account by correction factors. From an economical point of view and in order to eliminate the coupling problems, it would obviously be desirable to perform the measurements directly in the duct. It is not surprising therefore that in the last 15 years several investigators have devoted their efforts to the in-duct test method. Refs 1 through 13 describe some of the more recent investigations. As a result of mainly British efforts, the British Standards Institution in 1966 submitted a proposal to the International Standards Organization which includes an in-duct method of sound measurement. A number of problems still remain, however, and it is the purpose of our current research to provide additional knowledge for the writing of an improved in-duct standard.