The Aerostar 20x25x1 MERV 13 Furnace A/C Air Filters come in a convenient 6 pack, making it easy to ensure clean and healthy air in your home for an extended period of time. These pleated filters are designed with electrostatic filtration technology to effectively capture airborne particles and improve indoor air quality. Made in the United States by Canopy, these filters are specifically sized at 19 3/4" x 24 3/4" x 3/4" to fit standard furnace and air conditioner systems. With a filter life of 3 months, these white filters are a reliable and efficient solution for maintaining a comfortable living environment. Aerostar 20x25x1 MERV 13 Furnace Air Filter, 6 Pack Nominal: 20 x 25 x 1, Size: 19 3/4"x24 3/4"x3/4" 20x25x1, AC Furnace Air Filter Comparable to 3M Filtrete MPR 1000 to 1200 Micro Allergen Defense Comparable to Honeywell Allergen Plus FPR 140 Fights lint, dust mites, mold spores, pollen, pet dander, dust, and smoke. Change frequency 60-90 days, Made in the USA.