CFR›Title 10›Chapter II›Part 431›Subpart E ContainsSections 431.81–431.82; Subject groups Energy Efficiency Standards–Test ProceduresCorpusDaily eCFRDisplayed edition2026-05-07Last updated2026-05-07 Subpart E—Commercial Packaged Boilers Contents 431.81 § 431.81 Purpose and scope. 431.82 § 431.82 Definitions concerning commercial packaged boilers. Energy Efficiency Standards Energy Efficiency Standards Section 431.87; Appendix A Test Procedures Test Procedures Sections 431.85–431.86 Source69 FR 61960, Oct. 21, 2004, unless otherwise noted. Previous D Subpart D—Commercial Warm Air Furnaces Next F Subpart F—Commercial Air Conditioners and Heat Pumps