3M™ Versaflo™ Formaldehyde/HEPA Cartridge TR-6350N is a combination High Efficiency (HE) particulate filter and Formaldehyde (FM) cartridge for use with 3M™ Versaflo™ Powered Air Purifying Respirator TR-600 series Systems. 3M recommends the use of the 3M™ Versaflo™ Filter Cover TR-6300FC to help protect the filter from physical damage. 3M™ Versaflo™ Formaldehyde/HEPA Cartridge TR-6350N is a combination High Efficiency (HE) particulate filter and Formaldehyde (FM) cartridge for use with 3M™ Powered Air Purifying Respirator Systems TR-600 series. This filter may also be suitable for operations where the primary hazard is particulate and/or formaldehyde gas, such as in preservative operations where formalin is handled. 3M recommends the use of the 3M™ Versaflo™ Filter Cover TR-6300FC to help protect the filter/cartridge from physical damage. The 3M™ Versaflo™ Filter Cover TR-6300FC is also used to hold the 3M™ Versaflo™ Prefilter TR-6600 or The 3M™ Versaflo™ Spark Arrestor TR-662 in place. For maximum Powered Air Purifying Respirator System run time, select the 3M™ Versaflo™ High Capacity Battery TR-632 when using the this cartridge. NIOSH approval: FM/HE