2 pack - Open box but unused! We moved out of our office recently and had these left over. Unused. Increased Efficiency: The ultra-dense filter reduces air resistance and increases efficiency with its advanced folded design. 3-Stage Filtration: Captures particles such as dust, smoke particles, pollen, and pet dander, as well as odors, fumes, smoke, and VOCs. Trap Household Odors: The High-Efficiency Activated Carbon Filter traps smoke, fumes, VOCs, and household odors such as cooking smells, pet odors, and cigarette smoke.