VERSAFLO™ Combination cartridge for certain particulates, organic vapour or acid gas for use with TR-600 series. Powered air purifying respirators. This filter or cartridge may be suitable for operations where the primary hazard is particulate and/or certain organic vapours or acid gases, such as in pharmaceutical manufacturing, mold remediation. 3M recommends the use of the TR-6500FC filter cover to help protect the filter or cartridge from physical damage. The TR-6500FC filter cover is also used to hold the TR-6600 pre-filter or TR-662 spark arrestor in place. For maximum PAPR system run time, select the TR-632 high capacity battery when using this cartridge.