OCS is certified to conduct either Qualitative or Quantitative fit testing. Because it is a respirator, an N95 mask needs to be tested just like full-face and half-face respirators. With N95 respirators being introduced to new types of industries, it is important for employees to wear a properly fitted mask to avoid any negative side-effects of breathing through a respirator over time. The individual wearing the respirator must remove any facial hair that lies where the seal has contact with the face.