What method is used to select the right size and type of respirator?

The fit test is essential for ensuring that the selected respirator provides a proper seal against the face, which is crucial for effective respiratory protection. This testing process helps identify whether the respirator fits the user's face shape and size appropriately, thus preventing the inhalation of hazardous substances.

During a fit test, the individual wears the respirator while performing a series of exercises, and the respirator's ability to maintain a tight seal is evaluated. A successful fit test confirms that the respirator not only fits well but also ensures that the user can effectively breathe while using it in a potentially hazardous environment. This step is critical because an improper fit can leave gaps, allowing harmful air contaminants to enter, significantly reducing the respirator’s effectiveness.

While other methods such as the appearance test, comfort test, and basic measurement may provide some initial insights into the suitability of a respirator, they do not assess the actual performance of the respirator in real-world conditions where a tight fit is vital.