近年来，已有“对现有管道规范的部分内容进行了解释，并在其他规范中制定了新的限制，从而限制或禁止在冷冻饮用水冷却器中使用预冷器。行业工程师通过可用的科学信息进行的“仔细搜索”显示，没有公布的测试结果证明这些规范限制是合理的。因此，为了向管道规范编写机构以及公众提供事实检验结果，美国供暖、制冷和空调工程师协会公司参与了美国国家卫生基础测试实验室，研究了与水冷却器中的预冷却器相关的健康和传热因素。任何重大发现都应通过一份文件进行报告，该文件可在任何需要的情况下用于制定与饮用水冷却器及其预冷器相关的科学合理的规范。

During recent years, there have "been interpretations made for parts of existing plumbing codes and the development of new restrictions in other codes whereby the use of precoolers in refrigerated drinking water coolers was limited or forbidden. A careful search "by Industry Engineers through available scientific information revealed there were no published test results that would justify these code restrictions. Hence, in an attempt to provide factual test results to plumbing code writing authorities as well as to the general public, the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. engaged the National Sanitation Foundation Testing Laboratory, Inc. to study both health and heat transfer factors associated with precoolers in water coolers. Any significant findings were to be reported by a document that could be used, wherever desired, in the preparation of scientifically sound codes relating to drinking water coolers and the precoolers therein.