Face fit testing is a process that is used to ensure that a respirator or face mask provides an adequate seal to the wearer’s face and is effectively protecting them from inhaling harmful particles, dust, or vapours. The testing process typically involves the use of specialized equipment to measure the fit and seal of the mask against the wearer’s face while they are performing a series of exercises such as moving their head, talking, or bending over. The tests are designed to ensure that the mask is correctly fitted and provides a tight seal around the face, preventing harmful substances from entering the breathing zone. Face fit testing is an essential requirement for individuals working in hazardous environments, where the use of respirators or masks is necessary to prevent exposure to airborne contaminants.