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.