Clean lumber
Clean lumber means wood or wood products that have been cut or shaped and include wet, air-dried, and kiln-dried wood products. Clean lumber does not include wood products that have been painted, pigment-stained, or pressure-treated by compounds such as chromate copper arsenate, pentachlorophenol, and creosote, or manufactured wood products that contain adhesives or resins (e.g., plywood, particle board, flake board, and oriented strand board).
Source
40 CFR § 60.3078
Scoping language
Terms used but not defined in this subpart are defined in the Clean Air Act and subpart A (General Provisions) of this part.