2500 Series N95 Particulate Respirators - n95 particulate respirator plus nuisance ac [Set of 10] Moldex 2500N95 100-Percent PVC-Free Plus Relief From Nuisance Levels (less than OSHA Permissible Exposure Limit) of Acid Gas Irritants. Added sorbent helps filter out nuisance levels of acid gas irritants. Exhale valve lets workers breathe easy and stay cool. Dura-Mesh shell resists collapsing in heat and humidity.