NR 440.48(2)(a)7.7. “Organic coating” means any coating used in a surface coating operation, including dilution solvents, from which volatile organic compound emissions occur during the application or the curing process. For the purpose of this section, powder coatings are not included in this definition. NR 440.48(2)(a)8.8. “Powder coating” means any surface coating which is applied as a dry powder and is fused into a continuous coating film through the use of heat. NR 440.48(2)(a)9.9. “Spray application” means a method of applying coatings by atomizing and directing the atomized spray toward the part to be coated. NR 440.48(2)(a)10.10. “Surface coating operation” means the system on a metal furniture surface coating line used to apply and dry or cure an organic coating on the surface of the metal furniture part or product. The surface coating operation may be a prime coat or a topcoat operation and includes the coating application station or stations, flashoff area and curing oven. NR 440.48(2)(a)11.11. “Transfer efficiency” means the ratio of the amount of coating solids deposited onto the surface of a part or product to the total amount of coating solids used. NR 440.48(2)(a)12.12. “VOC content” means the proportion of a coating that is volatile organic compounds (VOCs), expressed as kilograms of VOCs per liter of coating solids. NR 440.48(2)(a)13.13. “VOC emissions” means the mass of volatile organic compounds (VOCs), expressed as kilograms of VOCs per liter of applied coating solids, emitted from a metal furniture surface coating operation. NR 440.48(2)(b)(b) As used in this section, symbols not defined in this paragraph have the meanings given in s. NR 440.03. NR 440.48(2)(b)1.1. Ca is the VOC concentration in each gas stream leaving the control device and entering the atmosphere (parts per million by volume, as carbon). NR 440.48(2)(b)2.2. Cb is the VOC concentration in each gas stream entering the control device (parts per million by volume, as carbon). NR 440.48(2)(b)3.3. Cf is the VOC concentration in each gas stream emitted directly to the atmosphere (parts per million by volume, as carbon). NR 440.48(2)(b)4.4. Dc is the density of each coating, as received (kilograms per liter). NR 440.48(2)(b)5.5. Dd is the density of each diluent VOC solvent (kilograms per liter). NR 440.48(2)(b)6.6. Dr is the density of VOC solvent recovered by an emission control device (kilograms per liter). NR 440.48(2)(b)7.7. E is the VOC destruction efficiency of the control device (fraction). NR 440.48(2)(b)8.8. F is the proportion of total VOCs emitted by an affected facility that enters the control device (fraction). NR 440.48(2)(b)9.9. G is the volume-weighted average mass of VOCs in coatings consumed in a calendar month per unit volume of coating solids applied (kilograms per liter). NR 440.48(2)(b)11.11. Ld is the volume of each diluent VOC solvent added to coatings (liters). NR 440.48(2)(b)12.12. Lr is the volume of VOC solvent recovered by an emission control device (liters). NR 440.48(2)(b)15.15. Mo is the mass of VOCs in coatings consumed as received (kilograms). NR 440.48(2)(b)16.16. Mf is the mass of VOCs recovered by an emission control device (kilograms). NR 440.48(2)(b)17.17. N is the volume-weighted average mass of VOC emissions to the atmosphere per unit volume of coating solids applied (kilograms per liter). NR 440.48(2)(b)18.18. Qa is the volumetric flow rate of each gas stream leaving the control device and entering the atmosphere (dry standard cubic meters per hour). NR 440.48(2)(b)19.19. Qb is the volumetric flow rate of each gas stream entering the control device (dry standard cubic meters per hour). NR 440.48(2)(b)20.20. Qf is the volumetric flow rate of each gas stream emitted directly to the atmosphere (dry standard cubic meters per hour). NR 440.48(2)(b)21.21. R is the overall VOC emission reduction achieved for an affected facility (fraction).