Furnace 1 6 1/2 x Pack Filter, 3/8 21 x Air Air Filter, AC 16 Aerostar 8 MERV Pleated

Nominal Size: 16-3/8 x 21-1/2 x 1, Actual Size: 16-3/8" x 21-1/2" x 3/4" Comparable to 3M Filtrete MPR 600 Clean Living Comparable to Honeywell Micro Defense Plus FPR 5 Fights lint, dust mites, mold spores, pollen, pet dander, and dust. Change frequency 60-90 days, Made in the USA. Aerostar 16 3/8 x 21 1/2 x 1 MERV 8 Pleated Air Filter, AC Furnace Air Filter, 6 Pack Nominal Size: 16 3/8 x 21 1/2 x 1, Actual Size: 16 3/8" x 21 1/2" x 3/4" Comparable to 3M Filtrete MPR 600 Clean Living and Honeywell Micro Defense Plus FPR 5 Filters out microscopic particles and allergens such as lint, dust mites, spores, and pollen For best results, change your filters every 60-90 days. Increase frequency to every 30 days during peak summer and winter months Made with electrostatically charged synthetic material for high filtration efficiency with low air flow resistance Manufactured in the USA by Filtration Group, a world-leading manufacturer and supplier of filtration solutions for healthier indoor air quality