Aggregation of Emission Units For Which Construction or Modification Commenced Prior to April 14, 1972

Section 212 Section 212.208  Aggregation of Emission Units For Which Construction or Modification Commenced Prior to April 14, 1972 Section 212.207 of this Subpart may be applied to the aggregate of all fuel combustion emission units for which construction or modification commenced prior to April 14, 1972, vented to a common stack provided that after January 26, 1972: a)         Ductwork has not been modified so as to interconnect such  fuel combustion emission units; b)         The actual heat input to any such fuel combustion emission units is not increased; and c)         No new fuel combustion emission unit is added to reduce the degree of control of emissions of particulate matter required by this Subpart.