Nordic Pure MERV 13 Air Filters are engineered to capture over 90% of airborne particles from 3.0-10.0 microns, effectively filtering out contaminants such as lint, dust, pollen, pet dander, mold spores, and even particles from coughs, sneezes, and smog. These filters also remove over 90% of finer particles in the 1.0-3.0 micron range, and up to 75% of ultra-fine particles as small as 0.3-1.0 microns, delivering superior indoor air quality. Constructed with electrostatically charged synthetic materials, each filter features a durable, moisture-resistant frame and metal mesh reinforcement to ensure reliable performance in HVAC systems. For peak air quality and HVAC efficiency, replace filters regularly, especially in households with pets or high activity levels.