Section 60.120 - Applicability and designation of affected facility(a) The provisions of this subpart are applicable to the following affected facilities in secondary lead smelters: Pot furnaces of more than 250 kg (550 lb) charging capacity, blast (cupola) furnaces, and reverberatory furnaces.(b) Any facility under paragraph (a) of this section that commences construction or modification after June 11, 1973, and on or before December 1, 2022, is subject to the requirements of this subpart.42 FR 37937, July 25, 1977, as amended at 88 FR 80610, Nov. 20, 2023 As amended at 88 FR 80610, 11/20/2023