Face Fit Testing

  The qualitative method relies on the wearer’s taste response to the presence of the solution.   

The seven-test protocol that is used for this method is the same as what is required by other test methods and is described in INDG 479. This method of face fit testing is suitable for filtering facepieces (disposable masks) and reusable half masks. 

This method is not suitable for full face masks. 

The fit factor determines whether there is an effective face seal present during the test.   

As with the qualitative testing a seven-test protocol is used to determine the robustness of the face seal. These tests mimic day to day activities that would be carried out whilst wearing a respirator. The fit factor that is required for a pass is determined by the type of respirator that is being fitted. Further details of the required pass levels for a good fit factor can be found in 

INDG 479 along with information about the seven-test protocol.

This method of testing can be used to fit test all types of tight-fitting masks including disposable, half and full face masks. In contrast to qualitative testing this method provides an objective, numerical result known as the fit factor.