Kiln
Kiln means a device, including any associated preheater or precalciner devices, inline raw mills, inline coal mills or alkali bypasses that produces clinker by heating limestone and other materials for subsequent production of portland cement. Because the inline raw mill and inline coal mill are considered an integral part of the kiln, for purposes of determining the appropriate emissions limit, the term kiln also applies to the exhaust of the inline raw mill and the inline coal mill.
Source
40 CFR § 63.1341
Scoping language
All terms used in this subpart that are not defined in this section have the meaning given to them in the CAA and in subpart A of this part.