Vertiv (NYSE: VRT), a global provider of critical digital infrastructure and continuity solutions, today introduced the new, highly efficient Vertiv™ Liebert® PDX-PAM direct expansion perimeter units with low global warming potential (GWP) and non-flammable R513A refrigerant. Available now in Europe, Middle East and Africa (EMEA), the system is designed to operate with an eco-friendly refrigerant (as compared to legacy refrigerants) to enable increased efficiency, reliability and maximum flexibility of installation.