The new fit testing standards establishes the new filtering efficiency and performance criteria for all non-powered, air-purifying, particulate-filter respirators. A good fit testing program is necessary to make sure the respirator will not leak under normal use and working conditions. The new standard allows respirator users to continue using and purchasing air-purifying particulate-filter respirators certified under the old standards. This program will explain the new rules and procedures for proper fit testing of respiratory equipment.