Each respirator user shall be fit tested on an annual basis, unless semi-annual fit testing is required by a specific OSHA Standard. Several brands of respirators shall be made available to employees to insure a proper fit. All employees who don a respirator should be clean shaven. The negative-pressure test is conducted by placing the mask on the face and covering the filter inlets. The employee then inhales and notes any inward leakage of air.
Significant leakage indicates a poor seal.
The positive pressure test is conducted by covering the exhalation valve and blowing into the mask. Again, significant leakage indicates a poor seal. The facepiece shall be adjusted and the tests repeated if necessary until an adequate seal is obtained. The employee shall determine the suitability of wearing contact lenses when he or she is fitted for a respirator. Temple bars or corrective eye wear straps shall not interfere with the respirator's seal and shall not be used with a full-face respirator.