CFR›Title 24›Subtitle B›Chapter XX›Part 3285›24 CFR Part 3285 Subpart F Citation24 CFR Part 3285 Subpart FContainsSections § 3285.501–§ 3285.506CorpusDaily eCFRDisplayed edition2026-08-21Last updated2026-08-21 Subpart F—Optional Features Sections § 3285.501 § 3285.501 Home installation manual supplements. § 3285.502 § 3285.502 Expanding rooms. § 3285.503 § 3285.503 Optional appliances. § 3285.504 § 3285.504 Skirting. § 3285.505 § 3285.505 Crawlspace ventilation. § 3285.506 § 3285.506 Testing and certification for fire sprinkler systems. Authority42 U.S.C. 3535(d), 5403, 5404, and 5424.Source72 FR 59362, Oct. 19, 2007, unless otherwise noted.