In this chapter, the following terms have the meanings indicated. Terms Defined. “Cement kiln” means an installation, including any associated pre-heater or pre-calciner devices, that produces clinker by heating limestone and other materials to produce Portland cement. “Cement manufacturing installation” means process equipment used for subsequent production of Portland cement. “Clinker cooler” means an installation into which clinker product leaving the kiln is placed to be cooled by air supplied by a forced air draft or natural draft supply system. “Long dry kiln” means a cement kiln that does not have a pre-calciner and in which dry starting raw materials are fed into the kiln. “PM continuous parametric monitoring system” (CPMS) means a continuous emission monitoring system used to establish a parameter range for the purposes of demonstrating compliance. “Pre-calciner kiln” means a cement kiln that contains a pre-calciner at the bottom of the pre-heater tower before the materials enter the kiln. “30-day rolling average” means the arithmetic average of all valid hourly NOx emission rates of the previous 720 valid hours on a rolling basis. “30 process operating day” means: The first day after the compliance date following completion of the field testing and data collection that demonstrates that the CPMS or CEMS has satisfied the relevant CPMS performance evaluation or CEMS performance specification acceptance criteria; and For purposes of this chapter, the performance test period is complete at the end of the 30th consecutive operating day.