Fit testing for the N95 respirators is required, but can be performed qualitatively using isoamyl acetate (banana oi), saccharin solution, or Bitrex© Fig. 4a (see Fig. 4a), or quantitative using an approved device, such as Port-a-Count® (see Fig. 7, Fig. 8 ) 22 . The fit test must be performed with exact make, model, and size of respirator the HCW with be using in the workplace. Qualitative testing does not compromise the mask integrity and therefore after the test the employee can take the N95 with them for future single use (important consideration in time sof shortages). Quantitative fit tests require insertion of a probe through the mask, compromising mask integrity, and therefore the N95 must be discarded after a quantitative fit test. Fit testing is not required for loose-fitting PAPR hoods (which are used primarily by HCW with facial hair that does not allow a proper seal), because the breathing zone environment is under positive pressure and therefore a tight seal is not required for proper function and protection.
Fig. 7 Fit testing N95 mask with PortaCount®.
Fig. 8 Portacount® quantitative fit test device.
Fig. 9 Simple procedure mask with integrated face shield (not an N95). Used by general public. This could be worn on top of N95 for eye protection.