When it comes to breathing apparatuses, filters, and cartridges, reusable ones can be used for extended periods of time. As part of the maintenance of the respirator, it is necessary to replace the filters and cartridges when they wear out, as well as to clean the respirator when necessary. A new filter can also be added to the system in order to protect against a different type of risk. By wearing a half-mask respirator, the user is able to breathe simultaneously through his or her nose and mouth without blocking one of them. To prevent eye irritation caused by airborne particles and vapors, a full-face respirator covers the eyes as well as the upper face in order to prevent eye irritation caused by airborne particles and vapors.