CFR›Title 30›Chapter I›Part 33›Subpart B ContainsSections 33.20–33.23CorpusDaily eCFRDisplayed edition2026-05-08Last updated2026-05-08 Subpart B—Dust-Collector Requirements Sections 33.20 § 33.20 Design and construction. 33.21 § 33.21 Modification of test equipment. 33.22 § 33.22 Mode of use. 33.23 § 33.23 Mechanical positioning of parts. Previous A Subpart A—General Provisions Next C Subpart C—Test Requirements