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Road vehicles. Refrigerant systems used in mobile air conditioning systems (MAC). Safety requirements Ingestion-build-224916 See other cleanrooms standards in1 Scope This International Standard is restricted to refrigerant systems providing cooling or heating of passenger compartment, battery, etc., in passenger motor vehicles. It provides minimum design requirements for refrigerant containment and safety requirements of these systems. This International Standard addresses the use of only R 134a, R 1234yf and R 744refrigerants in vehicleoriginal equipment manufacturer (OEM) and aftermarket (non OEM)