21x23-5x1 MERV 13 Air Filter

MERV 13 synthetic media (comparable with MPR 1500 - 1900 & FPR 10) protects homes from bacteria and more by trapping 98% of airborne particles without impacting air flow. Electrostatically charged, pleated filters capture more harmful particles, last 3x longer than fiberglass models, and are 100% manufactured within the United States. Industrial grade beverage board (recyclable) frames with dual wire backings improve structural integrity and outperform standard cardboard designs. If you receive items with a different label, frame, or media than what is pictured, please note that any such alteration is purely cosmetic and your filter will still function exactly as described

Source reference: https://filterbuy.com/air-filters/21x23-5x1/merv-13/