Quantitative respirator fit testing: dynamic pressure versus aerosol measurement.
Am Ind Hyg Assoc J 1988 Oct; 49(10):492-496
Aerosol measurements with photometric recording, the conventional method of testing respirator performance, was compared with a dynamic pressure test. The dynamic pressure test measures the pressure decay inside the respirator resulting from a leak while the wearer is holding his breath. Respirators were sealed to the subjects' faces and leaks resulting from leak holes of various diameters were compared using the two tests. The leaks were located at the bridge of the nose, above the air intake or below the air intake. The results demonstrated that the aerosol test is dependent on the location of the sensor and the leak while the pressure decay is independent of these variables. The aerosol test demonstrated a maxima and minima based on the respiration of the wearer and the amount of aerosol deposited in the subjects lungs. The authors conclude that in these tests where there was no head movement or exercise the pressure decay test had less variability than did the aerosol test. The authors recommend that these test methods be evaluated with the wearer under physical stress.
NIOSH-Publication; NIOSH-Grant; Respiratory-protective-equipment; Aerosols; Personal-protective-equipment; Respirators; Air-purifying-respirators
Environmental Health University of Cincinnati Dept of Environmental Health Cincinnati, Ohio 45267
American Industrial Hygiene Association Journal
University of Cincinnati, Cincinnati, Ohio