High-Efficiency Filters capture smoke and dust — ideal if you mix dry chemicals, sand, grind, or do light welding or soldering. Prefilter is 30 to 35% efficient; high-efficiency cartridge is 96.5% efficient. HEPA Filters capture soldering fumes and vapors that contain lead. Prefilter is 30 to 35% efficient; HEPA filter is 99.97% efficient. Final Adsorption Carbon Module captures volatile solvents, touch-up paint fumes, and other noxious odors. Available in combination with primary high-efficiency or HEPA filter (33703-02 and -04), or use asa final stage for portable air cleaning system.