In summary, it can be demonstrated that the Ambient Aerosol method as used in the AccuFIT9000 is traceable to and compares extremely favorably to the proven “Gold Standard”.
CPC-AAC fit testing measures the concentration of these particulates in the breathing zone while the test subject is performing a series of exercises designed to stress or breach the seal of the respirator as they are wearing it.
We have seen numerous examples of respirators that do not fit the subject when they are fit-tested the following year. Primarily these are the N95-type filtering facepieces, but we have also observed the phenomenon with elastomeric respirators.
The next time one of your co-workers complains about the respirator fit test he or she is scheduled to undergo, show them the YouTube video below, which shows how fit testing was performed in the late 1930’s.