42 C.F.R. § 84.122

Current through September 30, 2024

Section 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

¹ Measured at end of the service life specified in Tables 5, 6, and 7 of this subpart.

42 C.F.R. §84.122