Genuine Hunter F1715P5 replacement air purifier pre-filter. Fits Hunter air purifier model HT1715. Silver nanoparticles in the Eco Silver pre-filter prevent the growth of microorganism on the filter, including bacteria and viruses. Coconut carbon in the pre-filter neutralizes odors, smoke, pollutants and allergens. Recommended to replace every 3 months for maximum efficiency, or more often depending on air quality & environmental factors. Package contains 8 replacement pre-filters. Approximate Dimensions: 5 x 5 inches.