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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 I - Gas Masks |
§ 84.122 - Breathing resistance test; minimum requirements.
Latest version.
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§ 84.122 Breathing resistance test; minimum requirements.
(a) Resistance to airflow will be measured in the facepiece or mouthpiece of a gas mask mounted on a breathing machine both before and after each test conducted in accordance with §§ 84.124, 84.125, and 84.126, with air flowing at a continuous rate of 85 liters per minute.
(b) The maximum allowable resistance requirements for gas masks are as follows:
Maximum Resistance
[mm. water-column height]
Type of gas mask Inhalation Exhalation Initial Final1 Front-mounted or back-mounted (without particulate filter) 60 75 20 Front-mounted or back-mounted (with approved particulate filter) 70 85 20 Chin-style (without particulate filter) 40 55 20 Chin-style (with approved particulate filter) 65 80 20 Escape (without particulate filter) 60 75 20 Escape (with approved particulate filter) 70 85 20