DuPont Ultimate Air Filters, 21-1/4in x 21-1/4in x 1in, Pack Of 4 Filters

Keep your air quality high using DuPont Ultimate Air Filters. Each filter can capture particles as small as 0.3 microns for high performance. High-performance media designed to capture submicron airborne particles as small as 0.3 microns. Captures and reduces up to 95% of airborne particles. MERV 13 rated. Should be changed every 90 days.