CFR›Title 24›Subtitle B›Chapter XX›Part 3285›Subpart F ContainsSections 3285.501–3285.506CorpusDaily eCFRDisplayed edition2026-05-07Last updated2026-05-07 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. Previous E Subpart E—Anchorage Against Wind Next G Subpart G—Ductwork and Plumbing and Fuel Supply Systems