What is a reason that a respirator might not fit properly?

A respirator might not fit properly if the user has not tested it for fit. Fit testing is a crucial step in the process of ensuring that a respirator provides an adequate seal around the face. If the seal is not tight, contaminants can enter the breathing zone, rendering the respirator ineffective. A proper fit test determines whether the respirator provides a satisfactory fit for the individual wearer, taking into account the specific characteristics of their face shape and size. Without this essential step, users may assume their respirator is providing protection when it is not, leading to potential exposure to harmful substances.

The other options may contribute to comfort or usability, but they do not directly address the critical issue of achieving a proper seal and fit. For instance, while a respirator being too heavy may lead to discomfort and decrease the likelihood of proper use, it doesn’t inherently affect the fit of the mask. A user having a cold could potentially affect their perception of fit if they experience nasal congestion, but this does not imply that the respirator itself is poorly fitted. Lastly, improper storage of the respirator may damage it, but it still does not specifically relate to the fit quality being tested. Thus, fit testing remains the key focus for ensuring a proper and effective