Aerostar 20x20x1 Air Filter MERV 13 (For Allergies, Dust, Lint, Mold, Pet Dander, Smoke, Smog & Bacteria) - Electrostatic MPR 1500 - 1900 & FPR 10 - Pleated HVAC AC Furnace Air Filters - Pack of 4

Nominal size: 20x20x1; Actual size: 19 3/4" x 19 3/4" x 3/4"; This MERV 13 filter is comparable with MPR 1500-1900 & FPR 10 Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, smoke, viruses, and bacteria Simple to install and a cost-effective step towards a healthier home environment; For best results, change your filters every 60 to 90 days but increase frequency to 30 days during peak summer and winter months 100% synthetic electrostatic media for high efficiency with low air flow resistance Manufactured by Filtration Group, a world-leading manufacturer and supplier of filtration solutions making the world safer, healthier & more productive