# What definitions should I be aware of?
**CFR Correction**
In Title 40 of the Code of Federal Regulations, Part 63 (§§ 63.600 to 63.1199), revised as of July 1, 2011, on page 602, § 63.1196 is reinstated to read as follows:
**40 CFR Part 63**
§ 63.1196
Terms used in this subpart are defined in the Act, in § 63.2 of the general provisions in subpart A of this part, and in this section as follows:
*Bag leak detection system* means a monitoring device for a fabric filter that identifies an increase in particulate matter emissions resulting from a broken filter bag or other malfunction and sounds an alarm.
*Bonded product* means mineral wool to which a hazardous air pollutant-based binder (containing such hazardous air pollutants as phenol or formaldehyde) has been applied.
*CO* means, for the purposes of this subpart, emissions of carbon monoxide that serve as a surrogate for emissions of carbonyl sulfide, a compound included on the list of hazardous air pollutants in section 112 of the Act.
*Cupola* means a large, water-cooled metal vessel to which is charged a mixture of fuel, rock and/or slag, and additives. As the fuel is burned, the charged mixture is heated to a molten state for later processing to form mineral wool.
*Curing oven* means a chamber in which heat is used to thermoset a binder on the mineral wool fiber used to make bonded products.
*Fabric filter* means an air pollution control device used to capture particulate matter by filtering gas streams through fabric bags. It also is known as a baghouse.
*Formaldehyde* means, for the purposes of this subpart, emissions of formaldehyde that, in addition to being a HAP itself, serve as a surrogate for organic compounds included on the list of hazardous air pollutants in section 112 of the Act, including but not limited to phenol.
*Hazardous air pollutant* means any air pollutant listed in or pursuant to section 112(b) of the Act.
*I* means the owner or operator of a mineral wool production facility.
*Incinerator* means an enclosed air pollution control device that uses controlled flame combustion to convert combustible materials to noncombustible gases.
*Melt* means raw materials, excluding coke, that are charged into the cupola, heated to a molten state, and discharged to the fiber forming and collection process.
*Melt rate* means the mass of molten material discharged from a single cupola over a specified time period.
*Mineral wool* means a fibrous glassy substance made from natural rock (such as basalt), blast furnace slag or other slag, or a mixture of rock and slag. It may be used as a thermal or acoustical insulation material or in the making of other products to provide structural strength, sound absorbency, fire resistance, or other required properties.
*New source* means any affected source the construction or reconstruction of which is commenced after May 8, 1997.
*PM* means, for the purposes of this subpart, emissions of particulate matter that serve as a surrogate for metals (in particulate or volatile form) on the list of hazardous air pollutants in section 112 of the Act, including but not limited to: antimony, arsenic, beryllium, cadmium, chromium, lead, manganese, nickel, and selenium.
*You* means the owner or operator of a mineral wool production facility.