Sperian Saf-t-fit Plus N95 Disposable Respirator With Exhalation Valve . This Honeywell Respirator can be used for sanding dusting fume inhalation metal fume removal paper machinist fume removal and other dust generating operations. The boomerang nose seal on this Honeywell Respirator can be used for double sheeting gas masks or respirators with a rebreather valve. When you use these Honeywell N95 Respirator w/ Exhalation Valve the valve automatically opens to let any air in that can cause discomfort or sickness out. This feature also prevents the buildup of condensation that can occur when the N95 respirator is donning its workday design. Package Contents: Sperian Saf-t-fit Plus N95 Disposable Respirator With Exhalation Valve