Lasting and lightweight filter housing: for better comfort. Suitable for use in ATEX zones: and/or in the nuclear industry. High performance filtration of gas and particles beyond CE requirements: for longer and excellent filtration effectiveness. Specific cartridge structure: for better breathing resistance and user comfort. Adapted design: clearing the field of view. Safe storage: between each use (cover). Available in economic, bulk version (box of 27 filters). This filter can be used in combination with the half face mask N7700 Class 2 (N67701) and full face mask Optifit Class 2 (17150).