Fellowes AeraMax SE Combo FilterTo ensure your AeraMax SE is providing the most powerful air purification possible, it is essential to keep up with recommended filter changes. The AeraMax SE Combo Filter is comprised of the (three) filter(s) your AeraMax SE needs to maintain H13 True HEPA filtration, while effectively removing 99. 95% of particles as small as 0. 1 microns including allergens, pollen, dust, pet dander and smoke. Each filter has an impressive lifespan of 1 year,