Aerostar 20x25x4 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 19 1/2"x24 1/2"x3 3/4")CHECK YOUR FIT Nominal size: 20x25x4; Actual size: 19 1 2"x24 1 2"x3 3 4"; This MERV 13 filter is comparable with MPR 1500 1900 & FPR 10. SUPERIOR FILTRATION EFFICIENCY Aerostar filters are made with electrostatically charged synthetic material that draws and captures allergens including lint, dust mites, mold spores, pollen, pet dander, and dust. IMPROVE INDOOR AIR QUALITY Protect your family and loved ones with clean indoor air quality at home.