Filtrete(TM) Ultra Allergen Reduction Filters 2017DC-6, 18 in x 18 in x 1 in (45.7 cm x 45.7 cm x 2.54 cm). The Filtrete(TM) Ultra Allergen Reduction Filter Attracts And Captures Microscopic Particles Like Bacteria And Particles That Can Carry Viruses And Large Particles Like Mold Spores And Pollen. For Residential Use Only.