Filter King 24x25x4 Air Filter 4-PACK MERV 8 Actual Size 23.5 x 24.5 x 3.75″

Filter King 20x40x1 Air Filter 6-PACK MERV 8 Actual Size 19.5 x 39.5 x .75″

Filter King 20x40x1 Air Filter 4-PACK MERV 13 Actual Size 19.5 x 39.5 x .75″