Filtrete 18x30x1 Air Filter, MPR 1500 MERV 12, Advanced Allergen Reduction, 1 New Filter 5564.8 out of 5 Stars. 556 reviews Save with Filtrete 12x24x1 Air Filter, MPR 1900 MERV 13, Ultimate Allergen Reduction, 4 Filters Add $87.88current price $87.88Filtrete 12x24x1 Air...