What is the purpose of performing a fit check when using a respirator?

• A. To measure breath rate
• B. To determine pesticide potency
• C. To check pesticide residue
• D. To ensure a tight-fitting seal with no leaks

Answer: (D)

A respirator only protects you if it seals tightly to your face. The fit check is done to verify that snug seal and to detect any leaks around the edges before you start working. By checking both how the facepiece behaves when you breathe in and when you breathe out, you confirm that air is being drawn through the filter and not sneaking in around the mask. If you feel air escaping at the nose, cheeks, or chin, or the facepiece shifts with movement, you need to adjust the fit or try a different size or model. This step is about ensuring proper protection, not about breath rate, pesticide potency, or residue.