Designed specifically for the Legend Brands HEPA 700, these pre-filters (125029) and HEPA primary filter (sold separately) ensure the highest air filtration efficiency. With its standard 1" pre-filter and primary HEPA filter media, the HEPA 700 removes dust, mold and other particulates and passes the stringent DOP air filtration tests often required. The optional activated carbon filter with a 1" pre-filter and HEPA filter will remove odors, fumes and smoke - especially helpful in wildfire-prone areas.