P100 Pancake Low Profile Flexible Filter with Odor Relief From Nuisance Levels of Organic Vapors, Acid Gases & Ozone, 1 Pair Air purifying filters provide respiratory protection against aerosols by removing dusts and fumes Provides respiratory protection against gases and vapors by using sorbents to purify inhaled air They are designed to fit in different tight places Approved by the NIOSH standard, to be used with the North full-face and half-masks Pancake filters can be used alone on the masks or in conjunction with the North chemical cartridges The air purifying filters provide respiratory protection against aerosols by removing dusts, mists, fumes, fibers and other particles Air purifying cartridges also provide respiratory protection against gases and vapors by using sorbents to purify the inhaled air They are designed to fit in different tight places The pancake series is approved by the niosh standard, to be used with the north full-face and half-masks These pancake filters can be used alone on the masks or in conjunction with the north chemical cartridges