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Code of Federal Regulations Title 42. Public Health § 42.84.91 Breathing resistance test;  exhalation

Current as of January 02, 2025 | Updated by Findlaw Staff

(a) Resistance to exhalation airflow will be measured in the facepiece or mouthpiece of open-circuit apparatus with air flowing at a continuous rate of 85 liters per minute.

(b) The exhalation resistance of demand apparatus shall not exceed 25 mm. (1 inch) water-column height.

(c) The exhalation resistance of pressure-demand apparatus shall not exceed the static pressure in the facepiece by more than 51 mm. (2 inches) water-column height.

(d) The static pressure (at zero flow) in the facepiece shall not exceed 38 mm. (1.5 inches) water-column height.

(e) Resistance to exhalation airflow will be measured in the facepiece or mouthpiece of closed-circuit apparatus with a breathing machine as described in § 84.88, and the exhalation resistance shall not exceed 51 mm. (2 inches) water-column height.

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Cite this article: FindLaw.com - Code of Federal Regulations Title 42. Public Health § 42.84.91 Breathing resistance test;  exhalation - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-42-public-health/cfr-sect-42-84-91/

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