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Fit testing methods.
The question as to whether a facepiece will be a good fit for a user can best be answered by carrying out a fit test.
Two methods can be used to determine the answer to this question.
Qualitative fit testing
Quantitative fit testing
bullet Assessment of how the face and facepiece fit together based on the subjective statements of the user
bullet This is not a quantitative assessment, only a "fits" or "does not fit" statement made by the user
bullet This is permissible for half masks and particle-filtering facepieces.
bullet More »
bullet Assessment of how well the face and facepiece fit based on objective fit factors measured using instrumentation
bullet Calculation of the fit factor os determined by measurements tested with a measurement instrument
bullet Permissible for half masks, full face masks and with particle filtering facepieces. However, particle ffps can only be quantitatively measured using an special system, e.g. the N95 fit test companion
bullet More »
Calculation of fit factors during quantitative testing
There are currently two instruments available for determining fit factors in quantitative fit tests:
- Portacount, from TSI
- Fit Tester 3000, from OHD

When using a Portacount testing device, the fit factor is calculated based on the quotient of particulate concentration inside and outside the facepiece. The FitTester 3000 calculates fit factors by measuring negative pressure inside the facepiece. Depending on the applicable standards, varying fit factor levels are required by lawmakers.
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