Filtrete Vacuum Filters are guaranteed to be free from defects in material and workmanship * Filtrete HEPA Vacuum Filters help trap 99.97% of all airborne pollutants 0.3 microns or larger, including mold spores, pet dander, grass and ragweed pollen * Filtrete media contains electrostatically charged fibers that work like magnets to attract and capture particles * Vacuum Filters should be replaced every 90 to 120 days for optimum performance