Heat input rate
Heat input rate means the amount of heat input (in mmBtu) divided by unit operating time (in hr) or, with regard to a specific fuel, the amount of heat input attributed to the fuel (in mmBtu) divided by the unit operating time (in hr) during which the unit combusts the fuel.
Source
40 CFR § 97.2
Scoping language
The terms used in this part shall have the meanings set forth in this section as follows: