FACEPIECE FITTING
28 P/N 595390-01 Rev B 201910
CBRN SCBA or APR
If you are fit testing for CBRN SCBA Open Circuit mode of operation (minimum fit factor equal to or greater than 500
minimum) or CBRN APR (minimum fit factor equal to or greater than 2000 minimum), appropriate negative pressure
testing equipment must be used. For example:
• If you are fit testing for CBRN SCBA Open Circuit or CBRN APR, use a P100 Filter (P/N 052683) and Fit Test
Adapter (P/N 201520-01).
• If you are using a facepiece that has been specially modified for a fit testing program such as that described in
NIOSH Procedure No. RB-CET-STP-CBRN-0352, Determination of Laboratory Respirator Protection Level
(LRPL) Quantitative, Medium Flow, Deep Probe, Corn Oil, Fit Factor Performance Test For Chemical, Biological,
Radiological and Nuclear (CBRN) Full Facepiece Respiratory Protection Devices (RPD) Standard Testing
Procedure, install the appropriate filtration element directly into the 40 mm facepiece adapter.
Fit Testing Procedure
Negative Pressure Leak Test
The size and style facepiece must be selected based on the user’s measured face size. For the initial fitting of the
facepiece, conduct a negative pressure leak test as described in the operating and maintenance instructions provided
with the respirator. Follow the procedure carefully. If the selected facepiece does not pass the negative pressure leak
test or does not fit securely without movement in the chin or chin cup area, or if the user experiences discomfort in
the chin or throat, try the next nearest size, larger or smaller. After passing the negative pressure leak test, the
facepiece size selected must be verified by successfully passing a respirator quantitative fit test.
A leak that is detected from a location other than the face-to-facepiece seal may indicate damaged or defective
equipment. Remove the defective equipment from service and tag it for repair by authorized personnel. Repeat the
testing with equipment known to be operating properly.
Quantitative Fit Testing
Test subjects must be in good health at the time of the fit testing. Smoking or eating less than 30 minutes prior to the
test is prohibited. Any and all conditions that might interfere with a good face-to-facepiece seal must be addressed
and corrected before performing the fit testing.
To verify the fit factor of the respirator, testing must incorporate an exercise regimen of normal daily activities. 3M
requires the following set of fit test exercises, which are based on OSHA Standard 29 CFR Part 1910.134 Appendix A,
and ANSI/AIHA/ASSE Z88.10-2010 with modifications.
Each exercise is to be performed for 60 seconds (except as noted) in a standing position during the test:
• Normal breathing
• Deep breathing
• Turning head side to side
• Moving head up and down (look up/look down)
• Talking (read “The Rainbow Passage”)
• Grimace (15 seconds)
• Bending over (touch toes) / Reach up (hands toward the ceiling)
• Normal breathing
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