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