ASTM F3407 Test Method for Respirator Fit Capability for Negative-Pressure Half-Facepiece Particulate Respirators
- Similar to differential pressure in ASTM.
- Fully-formed respirator is tested mounted to an anthropometric head form.
- Airflow 85 liters per minute.
- Maximum allowable resistances:
- 25 mm H2O for exhalation
- 35 mm H2O for inhalation.
Part of NIOSH 42 CFR 84 Testing