42 CFR 84.1149 - Airflow resistance tests; all dust, fume, and mist respirators; minimum requirements.
(a) Resistance to airflow will be measured in the facepiece, mouthpiece, hood, or helmet of a dust, fume, or mist respirator mounted on a test fixture with air flowing at a continuous rate of 85 liters per minute, both before and after each test conducted in accordance with §§ 84.1144 through 84.1147.
[mm. water-column height]
|Type of respirator||Initial inhalation||Final inhalation||Exhalation|
|Pneumoconiosis- and fibrosis-producing dusts, or dusts and mists||12||15||15|
|Dust, fume, and mist, with single-use filter||30||50||20|
|Dust, fume, and mist, with reusable filter||20||40||20|
|Radon daughter||18||1 25||15|
|Asbestos dust and mist||18||25||15|
1 Measured after silica dust test described in § 84.1144.