3M - 6000 Series Respirator - Large. This half facepiece reusable respirator offers reliable and convenient respiratory protection and is suitable for many situations, helping provide protection against particulates and a wide variety of gases and vapors according to NIOSH approvals.. The 3M Half Facepiece Reusable Respirator 6000 Series helps provide protection against particulates and a wide variety of gases and vapors when used with approved cartridges and filters. When properly fitted and us