与最初制定测试标准时相比，暖通空调行业当前的趋势是使用增加的空气流量来提高空调效率。此外，当前的标准（ASHRAE 37）在测试空气处理机组时，对进气管道系统的设计有限制。它没有强制要求使用一个，只是建议在空间允许的情况下使用一个。由于标准中没有规定进气管道系统的具体长度（只有最小长度），因此在不同进气管道长度下测试空气处理器可能会导致风机性能错误。本研究的目的是制定长度缩短的进气管设计指南，以纳入AHRI和ASHRAE测试标准，从而降低错误测试失败的风险，并提高不同实验室测试结果的完整性。 本研究将评估室内空气处理机组中风扇的性能，包括流量、进气管长度、机组容量、风扇类型和电机配置等参数。本项目的另一个目标是，通过减少该入口管道长度，同时保持标准情况下的等效风机性能（根据ASHRAE 37，最小入口管道长度），减少测试装置（入口管道+测试装置+出口管道）的总体高度。引用:2019年年度会议，密苏里州堪萨斯城，扩展摘要

Current trend in HVAC industry is to use increased air flowrate to increase the air conditioners efficiency compared to when testing standards were originally developed. Also, the current standard (ASHRAE 37) has limited guideline about inlet ductwork design while testing an air handling unit. It doesn’t mandate using one but just recommends using one if the space permits. As there is no specific length (only the minimum length) for the inlet ductwork is provided in the standard, testing of the air handlers at different inlet duct length could lead to false performance of the fan. The purpose of this study is to develop an inlet duct design guideline with reduced length for inclusion in the AHRI and ASHRAE testing standards that reduces the risk of false testing failures and will lead higher integrity of the testing results at different laboratories. This study will evaluate the performance of fan in an indoor air handling unit for a number of parameters such as flow rate, inlet duct length, unit capacity, fan type and motor configuration. An additional objective of this project is to reduce the overall height of the testing setup (inlet duct+ test unit+ outlet duct) by reducing this inlet duct length while maintaining the equivalent fan performance as of the standard case (minimum inlet duct length as per ASHRAE 37).