CHECK YOUR FIT - Nominal size: 20x20x4; Actual size: 19 1/2"x19 1/2"x3 3/4"; This MERV 11 filter is comparable with MPR 1000-1200 & FPR 7. | 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. Aerostar filters are a simple to install and cost-effective step towards a healthier home environment, free of airborne allergens and particles that can trigger various allergy and asthma symptoms. | HIGH PERFORMING - 100% synthetic electrostatic media for high efficiency with low air flow resistance. For best results, change your filters every 60 to 90 days during normal times of year but increase frequency to 30 days during peak summer and winter months when your unit is working the hardest. | MADE IN THE USA - Aerostar filters are manufactured in the USA by Filtration Group, a world-leading manufacturer and supplier of filtration solutions for residential, commercial and industrial applications.

13x18x2 MERV 13 Pleated Air Filter for AC HVAC or Furnace (Pack of 2 Filters). AFB Platinum MERV 13, comparable with MPR 1500 to 1900 (Ultimate Allergen Defense) or Allergen Elite FPR 10. | HOSPITAL GRADE MERV 13 SYNTHETIC MEDIA: Attracts and captures airborne particles or allergens less than one micron in size such as pollen, fine dust, pet dander. Also captures bacteria, viruses carrying particles, mold spores and smoke. | LONG-LASTING: Designed to last up to 3 months. Suitable for residential and business or commercial use (Industrial grade). | MADE IN THE USA: Manufactured by FilterBuy in the USA using 100% American made components. | HIGH QUALITY: Filter frames are made of beverage board, which stays strong through humidity and temperatures up to 200° F. Synthetic media provides significantly higher particulate efficiency than standard cotton media.

25x28x4 MERV 8 Pleated Air Filter for AC HVAC or Furnace (Pack of 4 Filters). AFB Silver MERV 8, comparable with MPR 300 / 600 (clean living and dust & pollen). | MADE IN THE USA: Manufactured by FilterBuy in the USA using 100% American made components. | TRAPS 90% OF AIRBORNE PARTICLES: Say goodbye to dust, debris, lint, pollen, and pet dander. Say hello to better indoor air quality! | LONG-LASTING: Designed to last up to 3 months. Ideal for residential and commercial use. | HIGH QUALITY: Filter frames are made of beverage board, which stays strong through humidity and temperatures up to 200° F. Synthetic media provides significantly higher particulate efficiency than standard cotton media.

14x25x2 MERV 8 Pleated Air Filter for AC HVAC or Furnace (Pack of 2 Filters). AFB Silver MERV 8, comparable with MPR 300 / 600 (clean living and dust & pollen). | MADE IN THE USA: Manufactured by FilterBuy in the USA using 100% American made components. | TRAPS 90% OF AIRBORNE PARTICLES: Say goodbye to dust, debris, lint, pollen, and pet dander. Say hello to better indoor air quality! | LONG-LASTING: Designed to last up to 3 months. Ideal for residential and commercial use. | HIGH QUALITY: Filter frames are made of beverage board, which stays strong through humidity and temperatures up to 200° F. Synthetic media provides significantly higher particulate efficiency than standard cotton media.