Pancake Low Profile P100 Filter with Odor Relief is a new dimension in high efficiency filtration. This unique filter sets a new standard in respiratory protection for profile, convenience, protection and comfort. Pancake filter meets NIOSH class P100 requirements by having a minimum efficiency of 99.97% against any dust, mist or fume, oil or non-oil based. All North cartridges and filters are approved for use with either the 7700 or 5500 half masks or 5400 and 7600-8A full Facepiece. It is a flexible, high efficiency filter with built-in seal check capability. Eliminates the need to store several different kinds of cartridges and filters. Attachable as a prefilter to all North chemical cartridges.