Freon Refrigerants are part of a group of chlorofluorocarbons (CFC’s) and are stable, nonflammable but moderately toxic gases. They were developed as a safe replacement for ammonia, which was the main refrigerant of the time (1890’s – 1920’s). The number following the R (i.e. R404a) is the refrigerant class number used for identifying the refrigerant.
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