Advantage® 900 Half-Mask Respirator, Elastomer, MediumDesigned for repeated cleaning and decontamination resulting in dramatic cost savings over filtering face piece respirators The included mechanical speaking diaphragm allows for improved communication among essential workers, patients and the public Does not have an exhalation valve which allows for filtration of exhaled air, thereby providing a means of source control and use in a sterile field environment Reuse and cleaning capability make the