When should a respirator fit test be conducted?

Conducting a respirator fit test is critical for ensuring the safety and health of individuals who may be exposed to airborne contaminants. A fit test should be performed when a new respirator is issued to guarantee that it properly seals to the wearer’s face. This ensures the respirator will function effectively to provide the necessary protection.

Additionally, conducting a fit test annually allows for changes that may occur over time, such as weight fluctuations, facial hair growth, or other alterations that could affect the respirator's fit. It is also essential to perform a fit test after any significant changes that may impact how the respirator fits, such as surgery or major dental work. Regular fit testing helps to ensure ongoing effectiveness and compliance with safety regulations.

In contrast, limitations of fit testing only prior to training or infrequently during employment can lead to inadequate protection if the respirator no longer fits properly or if employees are using a respirator they haven't been adequately tested with after any changes. Therefore, the timeline suggested in the correct answer reflects best practices for ongoing safety in environments where respiratory protection is required.