... refrigeration equipment, transportation refrigeration equipment, or update equipment. R404A environmental-protection refrigerants Composition: HFC - 125 (44 percent), HFC - 134a ... 4%) and HFC - 143a (52%), for HFC type refrigerants, ODP value is zero, a replacement for R - 502 ... industrial standard HFC refrigerants.R - 404A applies in low-temperature new commercial ...