10 C.F.R. § 431.246 Energy conservation standards and their effective dates.
Title 10 - Energy
A unit heater manufactured on or after August 8, 2008, shall: (a) Be equipped with an intermittent ignition device; and (b) Have power venting or an automatic flue damper.
Title 10: Energy
PART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT
Subpart N—Unit Heaters
Energy Conservation Standards
§ 431.246 Energy conservation standards and their effective dates.