§60.121a. Definitions.

Blast furnace means any furnace used to recover metal from slag.

Lead means elemental lead or alloys in which the predominant component is lead.

Process fugitive emissions source means a source of particulate matter (PM) emissions at a secondary lead smelter that is associated with lead smelting or refining including, but not limited to, smelting furnace charging points; smelting furnace lead and slag taps; pot and refining furnaces; and casting kettles.

Reverberatory furnace includes the following types of reverberatory furnaces: stationary, rotating, rocking, and tilting.

Secondary lead smelter means any facility producing lead from a lead-bearing scrap material by smelting to the metallic form.