2 pack, replacement carbon filter, replace your filter every 3 months with regular use, 2 filters in 1, activated coconut carbon prefilter traps odors & other organic compounds, helps extend the life of the hepa filter by trapping larger particles as well, for use with ac300 & ac500 vornado purifiers.

• For use with Vornado Purifiers: AC300, AC350, AC500, and AC550
• High quality activated carbon filter absorbs odors from pets, cooking, smoking along with large particles to prolong life of HEPA filter
• Replace every 3 months