R454B Refrigerant is a blend of hydrofluoroolefins (HFOs) composed of 69.5% difluoromethane (R32) and 30.5% pentafluoroethane (R125). This binary mixture creates a zero-ozone depletion potential (ODP) refrigerant with a significantly lower environmental impact than other commonly used refrigerants such as R410A, R407C, and R134A.