User fit tests for respirators are done annually unless what occurs?

User fit tests for respirators are typically required to be conducted annually to ensure that the respirator properly fits the employee using it. However, one specific condition that necessitates additional fit testing before the annual requirement needs to be fulfilled is if the employee experiences a dramatic change in physical attributes such as weight, particularly if that could influence how the respirator fits.

Significant changes in a person's body weight can alter the fit of the respirator, leading to potential gaps or improper seals that compromise the effectiveness of respiratory protection. This makes it crucial for safety that any major changes in physical condition prompt immediate retesting.

Likewise, any other changes—like dental work or other factors that might affect facial structure—can also impact fit. This highlights the importance of maintaining a safe working environment and ensuring that protective equipment remains effective throughout the employee's tenure.