40 CFR § 63.11158 - What definitions apply to this subpart?

---
identifier: "/us/cfr/t40/s63.11158"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 63.11158 - What definitions apply to this subpart?"
title_number: 40
title_name: "Protection of Environment"
section_number: "63.11158"
section_name: "What definitions apply to this subpart?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "63"
part_name: "NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "57 FR 61992, Dec. 29, 1992, unless otherwise noted."
cfr_part: "63"
---


# 63.11158 What definitions apply to this subpart?

Terms used in this subpart are defined in the CAA, in 40 CFR 63.2, and in this section as follows:

*Anode copper* means copper that is cast into anodes and refined in an electrolytic process to produce high purity copper.

*Capture system* means the collection of components used to capture gases and fumes released from one or more emissions points and then convey the captured gas stream to a control device. A capture system may include, but is not limited to, the following components as applicable to a given capture system design: duct intake devices, hoods, enclosures, ductwork, dampers, manifolds, plenums, and fans.

*Melting furnace* means any furnace, reactor, or other type of vessel that heats solid materials and produces a molten mass of material.

*Secondary copper smelter* means a facility that processes copper scrap in a blast furnace and converter or that uses another pyrometallurgical purification process to produce anode copper from copper scrap, including low-grade copper scrap. A facility where recycled copper scrap or copper alloy scrap is melted to produce ingots or for direct use in a manufacturing process is not a secondary copper smelter.

*Smelting furnace* means any furnace, reactor, or other type of vessel in which copper scrap and fluxes are melted to form a molten mass of material containing copper and slag.

*Work practice standard* means any design, equipment, work practice, or operational standard, or combination thereof.