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Pursuant to 42 U.S.C. 6314, DOE has established definitions, materials incorporated by reference, sampling plans, representations requirements, enforcement provisions, and test procedures for certain varieties of compressors. Specifically, this final rule establishes full-load package isentropic efficiency as the applicable energy metric for certain fixed-speed compressors and part-load package isentropic efficiency as the applicable energy metric for certain variable-speed compressors. Finally, this final rule incorporates by reference certain sections of the ISO Standard 1217:2009(E), (ISO 1217:2009(E)), Displacement compressors - Acceptance tests, as amended through Amendment 1:2016, as the basis for a test method for determining compressor efficiency.