Affected unit means any reheat furnace meeting the applicability criteria of this section.
Day means a calendar day unless expressly stated to be a business day. In computing any period of time for recordkeeping and reporting purposes where the last day would fall on a Saturday, Sunday, or Federal holiday, the period shall run until the close of business of the next business day.
Low NOXburner means a burner designed to reduce flame turbulence by the mixing of fuel and air and by establishing fuel-rich zones for initial combustion, thereby reducing the formation of NOX.
Low-NOXtechnology means any post-combustion NOX control technology capable of reducing NOX emissions by 40% from baseline emission levels as measured during pre-installation testing.
Operating day means a 24-hour period beginning at 12:00 midnight during which any fuel is combusted at any time in the reheat furnace.
Reheat furnace means a furnace used to heat steel product-including metal ingots, billets, slabs, beams, blooms and other similar products-for the purpose of deformation and rolling.
40 C.F.R. §52.43