{"data":{"id":"us/42-cfr-84.301","jurisdiction":"us","citation":"42 CFR 84.301","heading":"Applicability to new and previously approved CCERs.","body":"(a) Any CCER approval issued after April 9, 2012 must comply with the technical requirements of subpart O.\n(b) The continued manufacturing, labeling, and sale of closed-circuit apparatus previously approved under subpart H is authorized for units required for use in underground coal mines pursuant to 30 CFR 75.1714-1.\n(c) Any manufacturer-requested modification to a device approved under the subpart H technical requirements must comply with the subpart H technical requirements and address an identified worker safety or health concern to be granted an extension of the NIOSH approval. Major modifications to the configuration that will result in a new approval must meet and be issued approvals under the requirements of this subpart O.","path":["Title 42—Public Health","CHAPTER I—PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER G—OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES","PART 84—APPROVAL OF RESPIRATORY PROTECTIVE DEVICES","Subpart O—Closed-Circuit Escape Respirators"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-42.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:11Z","sha256":"e709727979848ee29571cf1a37c7fbae2ebb1d5403dd6e9b05a518a12af13313","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-84.300","next":"us/42-cfr-84.302"},"notice":"GroundRules: Original legal text. Not legal advice."}