Quest MERV 13 Filter 18" X 20" X 2" for Quest 506, 506 277V, 746, and 876Description Quest MERV 13 Filter 18" X 20" X 2" for Quest 506, 506 277V, 746, and 876: This superior MERV13 filter effectively removes harmful contaminants from the air such as dust, pollen, mold, bacteria, and certain viruses, aiding in the prevention of cross contamination and the promotion of healthier conditions. Proven to be 65% more effective in capturing dangerous particles from the air compared to MERV 8, it also outperforms MERV11 filters by