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DOE initiated a rulemaking for commercial and industrial compressors under part A-1 of title III of the Energy Policy and Conservation Act (EPCA), as amended, using RIN 1904-AC83, which covered compressors in general.  Air compressors (like those addressed in that related rulemaking effort) and natural gas compressors are different equipment serving different markets and significantly different purposes. As a consequence, natural gas compressors are designed and built differently from their air compressor counterparts. To help account for these differences, DOE is establishing separate rulemakings to address energy conservation standards for:  (1) commercial and industrial air compressors; and (2) commercial and industrial gas compressors. To this end, DOE is splitting RIN 1904-AC83 into two separate rulemakings as follows:  (1) air compressors under 1904-AC83; and (2) gas compressors which will be addressed using this RIN.