Nordic Pure MERV 8 Plus Carbon Air Filters are designed to capture 70-85% of airborne particles between 3.0-10.0 microns, such as lint, dust, pollen, pet dander, and mold spores. Enhanced with an activated carbon layer, these filters also help reduce household odors from pets, cooking, smoke, and volatile organic compounds (VOCs). Made with electrostatically charged synthetic materials, each filter features a durable, moisture-resistant frame and metal mesh support for dependable performance in HVAC systems. Replace 1-2 inch filters every 30-90 days and 4-6 inch filters every 3-6 months, with more frequent changes in high-traffic or pet-filled areas.