Respirator fit and fit testing Fit testing is required for employees wearing tight-fighting respirators, such as disposable or reusable respirators. ✅✅ This procedure helps ensure the user has selected the correct size respirator and that a seal against the face can be made in order to provide the expected protection.✅✅ OSHA requires qualitative or quantitative fit testing before a user wears a mandatory respirator on the job, and must be assessed at least annually. In addition, fit tests should