-Designed To Fit As Air Doctor Filters – This replacement filter set is compatible with Air doctor AD3000 and 3500 models, ensuring seamless performance and fit. Dimensions are 17"L x 14"W x 2"Thickness. This is a third-party product, not OEM. -Effective Air Filtration Mechanism – This efficient air doctor 3500 replacement filters helps maintain clean indoor air by capturing dust, particles, and airborne debris for better air quality. Compatible with air doctor 3000 too. -Odor and Smoke Control – These air doctor filters - carbon pre-filters help reduce household odors, keeping your home or office smelling fresh. Ideal indoor air purifier filter replacement. -Easy Installation and Reliable Performance – These replacement filters are designed for quick setup and long-lasting use, ensuring consistent filtration efficiency. -Think Crucial Quality and Compatibility – Built to industry standards, these third-party replacement filters offer durability and dependable air purification for Air Dr. 3000 & 3500 units. -Think Crucial is a third-party replacement filter and is an independent brand for replacement filters