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The assembly complete Environmental Control and Life Support (ECLS) system for the International Space Station (ISS) will consist of components and subsystems in both the U.S. and International partner elements which together will perform the functions of Temperature and Humidity Control (THC), Atmosphere Control and Supply (ACS), Atmosphere Revitalization (AR), Water Recovery and Management (WRM), Waste Management (WM), Fire Detection and Suppression (FDS), and Vacuum System (VS) for the station. Due to limited resources available on ISS, detailed attention is given to minimizing and tracking all resources associated with all systems, beginning with estimates during the hardware development phase through measured actuals when flight hardware is built and delivered. A comprehensive summary of resources consumed by the U.S.

The baseline Environmental Control and Life Support System (ECLSS) for the International Space Station (ISS) includes regenerative and non-regenerative technologies for Temperature and Humidity Control (THC), Atmosphere Control and Supply (ACS), Fire Detection and Suppression (FDS), Atmosphere Revitalization (AR), Water Recovery and Management (WRM), Waste Management (WM), and Vacuum System (VS). The U.S. Lab module will contain complete THC and ACS subsystems and an open loop AR including a Carbon Dioxide Removal Assembly (CDRA), Trace Contaminant Control Subassembly (TCCS), and a Major Constituent Analyzer (MCA). An Oxygen Generation Assembly (OGA) is added with the U. S. Hab module, along with the WRM and WM subsystems. The final baseline configuration is a closed water loop and partially closed atmosphere loop and represents the best available mature technologies.