3M - Full Face Respirator - Large - 6900. This full facepiece reusable respirator offers lightweight comfort and ease of use. Combine with appropriate 3M particulate filters or cartridges to help provide respiratory protection against particulates and/or a variety of gases and vapors.. The 3M Full Facepiece Reusable Respirator 6000 Series helps provide protection against certain airborne contaminants. Versatile-use with 3M particulate filters, gas/vapor cartridges and supplied air respirator sys