Filtrete AD02-6PK-1E Air Filter, 20 x 20 x 1, White, 6 Pack Filtrete allergen defense air filters turn your Central heating and cooling system into a whole house air cleaner. Developed to pull in and trap unwanted particles, including: lint, dust and dust mite debris, mold spores and pollen, pet dander, and smoke and smog Designed with Filtrete brand 3-in-1 technology from 3M to pull in and trap unwanted air particles while letting clean air flow through Micro particle performance rating 1000 Outperforms fiberglass, Washable and non-electrostatic pleated 1 inch filters Lasts up to 3 months