CFR›Title 10›Chapter II›Part 431›Subpart R ContainsSections 431.301–431.302; Subject groups Energy Conservation Standards–Test ProceduresCorpusDaily eCFRDisplayed edition2026-05-07Last updated2026-05-07 Subpart R—Walk-in Coolers and Walk-in Freezers Contents 431.301 § 431.301 Purpose and scope. 431.302 § 431.302 Definitions concerning walk-in coolers and walk-in freezers. Energy Conservation Standards Energy Conservation Standards Section 431.306; Appendices A–C1 Test Procedures Test Procedures Sections 431.303–431.305 Source74 FR 12074, Mar. 23, 2009, unless otherwise noted. Previous Q Subpart Q—Refrigerated Bottled or Canned Beverage Vending Machines Next S Subpart S—Metal Halide Lamp Ballasts and Fixtures