Package Including: The package includes 2 x True HEPA Filter B and 8 x Activated Carbon Filters, which are cost-effective and can money. 4-in-1 Efficient :This FLT4825 hepa filter can capture dust, hairs, animal dander, and 99.97% of airborne particles as small as 0.3 , The activated carbon prefilter capture smoke, cooking fumes and noxious odors. Replace Filter: This FLT4825 hepa replacement filters easy to replace without the need for tools. To efficient operation of the filter, we recommend replacing the HEPA Filter B every 6-8 months and replace the activated carbon pre-filter every 2-3 monthsl, depends on personal use.