R-404A is a hydrofluorocarbon (HFC) blend refrigerant composed of R-125, R-134a, and R-143a. It was developed to replace R-502 and R-22, which are used in commercial refrigeration equipment for low and medium temperature ranges.
It is a non-flammable refrigerant with low toxicity, has an ASHRAE A1 safety classification, and has similar properties to the refrigerant it replaces.