This safety lesson explains the importance of respirator fit testing for workers in winery and vineyard environments. It covers when fit testing is required, how it’s done, and why a proper fit is critical for protection against airborne hazards like dust, mold, and chemicals. The video highlights the difference between qualitative and quantitative testing, and how to use and care for the respirator after testing. A well-fitted respirator keeps workers safe while handling hazardous materials or working in dusty environments.