This document outlines the purpose and processes of respiratory fit testing. The purposes include providing a consistent process for respirator clearance according to OSHA standards, preventing occupational diseases, testing workers with known respiratory hazards exposures, and ensuring employees can safely and effectively wear respirators. The medical evaluation involves questionnaires and possible physical exams by an authorized healthcare provider paid for by the employer. Fit testing procedures involve initial and annual certification, including completing questionnaires and medical clearance. Spirometry may be required depending on questionnaire responses or medical history changes. The medical provider determines clearance and any limitations for respirator use.