20x20x1 (19.6 x 19.6) Filtrete 2200 Elite Allergen Reduction Filter by 3M (4 Pack) Review May 27, 2018 No Comments Size Name:20 x 20 x 1 20x20x1 (19.6 x 19.6) Filtrete 2200 Elite Allergen Reduction Filter by 3Mtrade; Tags: 3M, Building Supplies, Furnace Filters, Furnace Parts & Accessories, Tools & Home Improvement