CFR›Title 10›Chapter II›Part 431›Subpart E›Subject Group Energy Efficiency Standards ContainsSection 431.87; Appendix ACorpusDaily eCFRDisplayed edition2026-11-03Last updated2026-11-03 Contents 431.87 § 431.87 Energy conservation standards and their effective dates. Appendix A to Subpart E of Part 431 Appendix A to Subpart E of Part 431—Uniform Test Method for the Measurement of Thermal Efficiency and Combustion Efficiency of Commercial Packaged Boilers Previous 431.82 § 431.82 Definitions concerning commercial packaged boilers. Next Test Procedures Test Procedures