"Control device efficiency" means, for purposes of 35 Ill. Adm. Code 218 and 219, the weight of VOM generated by an emission unit which is destroyed or removed by a control device, divided by the weight of VOM generated by such unit entering the control device, during a particular time period, expressed as a percentage.
Ill. Admin. Code tit. 35, § 211.1510
Added at 17 Ill. Reg. 16504, effective September 27, 1993