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Safe management of ammonia refrigeration systems January 2016 Page 5 of 49 INTRODUCTION 1. Ammonia1 has been used as a refrigerant in industrial applications for more than 150 years. It continues to be the refrigerant of choice in many food processing

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The main differences between A1 refrigerants, such as R-410A, R-134a, R-407C, and A2L refrigerants such as R-32, HFO R-1234yf and HFO R-1234ze is the ability to propagate a flame. A2L refrigerants will burn, but their burning velocity is below 10cm/s, which is lower than an A3 refrigerant such as

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