Negative pressure seal checks are t

Negative pressure seal checks are typically conducted on particulaterespirators that have exhalation valves. To conduct a negative pressureuser seal check, cover the filter surface with your hands as much as possibleand then inhale. The facepiece should collapse on your face andyou should not feel air passing between your face and the facepiece.In the case of either type of seal check, if air leaks around the nose, useboth hands to readjust the nosepiece by placing your fingertips at thetop of the metal nose clip. Slide your fingertips down both sides of themetal strip to more efficiently mold the nose area to the shape of yournose. Readjust the straps along the sides of your head until a properseal is achieved.2If you cannot achieve a proper seal due to air leakage, you may need tobe fit tested for a different respirator model or size.