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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 42 - Public Health |
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Chapter I - Public Health Service, Department of Health and Human Services |
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SubChapter G - Occupational Safety and Health Research and Related Activities |
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Part 84 - Approval of Respiratory Protective Devices |
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Subpart H - Self-Contained Breathing Apparatus |
§ 84.90 - Breathing resistance test; inhalation.
Latest version.
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§ 84.90 Breathing resistance test; inhalation.
(a) Resistance to inhalation airflow will be measured in the facepiece or mouthpiece while the apparatus is operated by a breathing machine as described in § 84.88.
(b) The inhalation resistance of open-circuit apparatus shall not exceed 32 mm. (1.25 inch) water-column height (at a flow rate of 120 liters per minute).
(c) The inhalation resistance of closed-circuit apparatus shall not exceed the difference between exhalation resistance (§ 84.91(e)) and 10 cm. (4 inches) water-column height.