The process used to determine the correct respirator size for a worker is commonly called:

• A. Fit test
• B. Size survey
• C. Fit verification
• D. Custom fitting

Answer: (A)

Choosing the correct respirator size is confirmed through a fit test. A fit test is a formal check that determines whether the respirator model and size provides a proper seal on the wearer’s face, ensuring that no harmful air leaks into the breathing zone. It can be done qualitatively, using a test agent the wearer can detect (taste, odor, or irritation), or quantitatively, with a device that measures actual leakage. The idea is to try different sizes (and sometimes models) until the test shows an adequate seal, which is why this is the指定 method for sizing.

A user seal check, or fit verification, is a quick check performed each time the respirator is worn to confirm the seal is still good, but it does not determine the correct size or model. The term “size survey” isn’t a standard practice, and “custom fitting” isn’t how respirator sizing is formally determined.