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The Filtrete, 20" x 25" x 4", Allergen Reduction Filter, 3 Month Filter, For Housing Units Accommodating 4" Nominal Size Filters & Is For Residential Use, Electrostatically Charged, Attracts & Captures Particles Like Pollen, Mold Spores, & Dust Mite Debris, MPR Rating 1550, Last Up To 12 Months, Actual Size: 19-3/4" x 24-7/16" x 4-3/16".