Except as provided in §§ 127.11a and 127.215 (relating to reactivation of sources; and reactivation), a person may not cause or permit the construction or modification of an air contamination source, the reactivation of an air contamination source after the source has been out of operation or production for 1 year or more, or the installation of an air cleaning device on an air contamination source, unless the construction, modification, reactivation or installation has been approved by the Department.
25 Pa. Code § 127.11
This section cited in 25 Pa. Code § 127.25 (relating to compliance requirement); 25 Pa. Code § 127.443 (relating to operating permit requirements); and 25 Pa. Code § 129.92 (relating to RACT proposal requirements).