Do you wear a mask at work?
If yes - then you need a face fit test.
If you wear a mask at work that relies on making a seal with your face then you need a face fit test. Face fit testing is a legal requirement under the hazardous substances, lead and asbestos regulations.
Escape set masks, filter masks, disposable masks and breathing apparatus masks all come in different sizes and shapes - if you are wearing the wrong mask, then it may not be protecting you.
A simple test taking only a few minutes can tell you whether your mask is right for you.