Holmes Twin Pack Air Purification D Filter: * True HEPA filtration * Helps remove up to 99.97% of airborne allergens as small as 0.3 microns from air passing through the filter * Particles of that size include grass and tree pollens, household dust, pet dander, mold spores and smoke * For use with Holmes Allergen Remover models HAP706 and HAP716 * Contains 2 filters per pack