CFR › Title 21 › Part 880 › §880.650021 CFR §880.6500Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. A medical ultraviolet air purifier is a device intended for medical purposes that is used to destroy bacteria in the air by exposure to ultraviolet radiation.(b)Classification. Class II (performance standards).