Replacement Pre-Filters: Pack of 3 gray slip-on fabric pre-filters are compatible with the Blueair Blue Pure 211+ and 211 Air Purifiers Prolonged Filter Efficiency: These accessories efficiently block larger particles from reaching your main filter, extending its lifespan and maintaining optimal performance Enhanced Particle Capture: The high-quality pre-filter fabric, with specially designed thread density, captures dust, dander, pet hair, lint, and common household airborne pollutants effectively User-Friendly Design: The ultra-easy slip-on, slip-off design of these washable pre-filters allows simple maintenance. Machine wash and hang dry for a perfect fit with your Blueair Blue Pure 211+ air purifier Pack Of 3: With this pack of 3 Replacement Pre-Filters Compatible With Blueair Pure 211+ Air Purifier, you can rotate pre-filters so you'll always have a fresh one on hand IMPRESA offers a practical solution to enhance indoor air quality with its 3 Pack Replacement Washable Pre-Filters, compatible with Blueair Blue Pure 211+ air purifiers. These pre-filters, in an elegant Lunar Rock Gray, are an essential addition for the colder months ahead, effectively capturing larger particles such as dust, dander, pet hair, and lint. Perfect for households with pets or in dusty environments, these pre-filters extend the life of your main air filter by blocking larger particles, thus maintaining optimal air purifier performance. Designed for busy families and individuals who prioritize a clean and healthy living space, these pre-filters are both practical and efficient. The user-friendly slip-on, slip-off design ensures easy installation and removal, making maintenance straightforward. To clean, simply machine wash and hang to dry, ensuring the pre-filters maintain their original fit after each wash cycle. This feature supports continuous use and helps keep your air purifier in top condition. Included in this set are three replacement washable pre-filters, allowing for rotation and consistent air purification without interruption. Ideal for those who seek a simple yet effective air cleaning solution, these pre-filters are compatible with Blueair Blue Pure 211+ models, seamlessly integrating into your home maintenance routine. Enhance your air purifier's efficiency with these durable pre-filters, ensuring a cleaner, healthier indoor environment with minimal effort.