20x20x4 Air Filter MERV 13

20x20x4 Air Filter (MERV 13) - Four Stages of Filtration:

Stage 1: High-Efficiency Layer (MERV 13 rating) blocks over 90% of pollutants as small as 3 microns, effectively capturing pollen, dust, and other common allergens.

Stages 2 and 3: Activated Carbon layer adsorbs harmful gases like carbon monoxide and sulfur dioxide. Combined with baking soda, it helps neutralize unpleasant odors.

Stage 4: Advanced Antimicrobial Technology reduces biological contamination by inhibiting the growth of algae, mold, fungi, and bacteria on the filter surface.