Code of Federal Regulations · Section
§ 84.147 — Type B Supplied-air Respirator; Minimum Requirements
42 C.F.R. § 84.147
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No Type B supplied-air respirator shall be approved for use with a blower or with connection to an air supply device at positive pressures.
Authorizing Statute
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Duties of United States Bureau of Mines30 U.S.C. § 3