DO NOT USE particulate respirators with an exhalation valve when working in a sterile field, such as an operating room. The exhalation valve allows droplets and particles exhaled by the health care worker to escape and potentially contaminate the surgical field. These respirators are light weight and do not restrict mobility. This respirator is a negative-pressure device using the suction produced by inhalation to draw air through the filter. The inhalation process, under the best of circumstances, will allow some contaminated air to leak into the facepiece.
Communication can be difficult.
Models with a full facepiece may fog up during use. These respirators may be available in as many as three sizes. Fit check this respirator every time you put it on to ensure a proper fit. Follow the manufacturers' recommendations, which can be found in the packaging. This respirator can be used for as long as it remains functional.