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In support of the Columbus ECLSS, a technology development program has been performed on four items: Regenerative CO2 removal Trace Gas Contamination Control Trace Gas Contamination Monitoring Low Noise Variable Speed Fan This paper describes the contents and results of the concluding Subsystem Level Tests and consecutive programme extensions which concentrated on: performance of the Contamination Monitoring Unit noise generation of the Variable Speed Fan lifetime tests of the CO2 removal solid amine closed water loop operation of a solid amine CO2 removal unit