Fire Protection Research Foundation report: "Evaluation of the Fire Hazard of ASHRAE Class A3 Refrigerants in Commercial Refrigeration Applications"
Author: Scott G. Davis, Ph.D., P.E., CFEI, Gexcon US, Inc., Bethesda, MD
Date of issue: October 2017
Introduction
The specific objectives of this study were to: (1) assess the flammability risk versus charge size; and (2) develop recommendations on how to prevent or mitigate the risks when using R-290 in commercial retail and kitchen applications. This type of study is needed to establish a technical basis for any changes to the current charge limits and to help determine whether A3 refrigerants can replace non-flammable refrigerants in a broader range of refrigeration applications that require larger charges than currently allowed by standards.