Does your mask fit? Is the mask leaking? Face fit testing of Respiratory Protective Equipment (RPE) is a legal requirement. RPE must be face fit tested as part of the selection process through either a quantitative or qualitative means. Qualitative uses a hood test, this works by spraying a sweet or bitter solution into the hood. If the wearer doesn’t detect the taste, an acceptable fit has been demonstrated. The mask wearer gives the result, certificates are manually prepared and printed by the tester.