For the purposes of NAC 445B.2204 to 445B.2205, inclusive, total feed sulfur must be calculated as the aggregate sulfur content of all fuels and other feed materials whose products of combustion and gaseous by-products are emitted to the atmosphere. When furnaces, sinter machines, sinter boxes, roasters, converters, or other similar devices are used for converting ores, concentrates, residues, or slag to the metal or the oxide of the metal either wholly or in part, the combined sulfur input of all units must be used to determine the allowable emission.
Nev. Admin. Code § 445B.22043
NRS 445B.210