US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 63 — NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIESSubpart NN — National Emission Standards for Hazardous Air Pollutants for Wool Fiberglass Manufacturing at Area Sources63.88840 C.F.R. § 63.888Startups and shutdowns.Last amended: 2016Year: 2026Length: 16 wordsOfficial source Cite as 40 C.F.R. § 63.888 (2026)You must meet all applicable startup and shutdown provisions contained in subpart NNN of this part.Previous40 C.F.R. § 63.887Next40 C.F.R. Table 1 to Subpart NN of Part 63