10 C.F.R. § 431.77 Energy conservation standards and their effective dates.
Title 10 - Energy
Each commercial warm air furnace manufactured on or after January 1, 1994, must meet the following energy efficiency standard levels: (a) For a gas-fired commercial warm air furnace with capacity of 225,000 Btu per hour or more, the thermal efficiency at the maximum rated capacity (rated maximum input) must be not less than 80 percent. (b) For an oil-fired commercial warm air furnace with capacity of 225,000 Btu per hour or more, the thermal efficiency at the maximum rated capacity (rated maximum input) must be not less than 81 percent.
Title 10: Energy
PART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT
Subpart D—Commercial Warm Air Furnaces
Energy Conservation Standards
§ 431.77 Energy conservation standards and their effective dates.
