CFR › Title 21 › Part 868 › §868.569021 CFR §868.5690Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. An incentive spirometer is a device that indicates a patient's breathing volume or flow and that provides an incentive to the patient to improve his or her ventilation.(b)Classification. Class II (performance standards).