The Weller 0053659099 Compact H13 HEPA-Gas Active Carbon Filter Cartridge is designed for use with the WFE2X Fume Extractor. It consists of a particle filter H13 and wide band gas filter. The wide band gas filter is 50% active carbon and 50% Chemisorb, while the H13 HEPA removes 99.95% of particles up to 0.3 microns.