24X24X1 Tri-Dim PRO Merv 7 High Capacity 3-month pleated air filter 24-pack case. The high capacity series offers the lowest resistance, highest dust holding capacity and the longest service life. Our exclusive Ultra XT media features Energy Savings via ultra low resistance - up to 50% lower than comparable products. Sturdy 2-die-cut frame is moisture resistant. Filter lasts 3 months. Made in the USA. 24x24x1 Actual filter size: 23-3⁄8 X 23-3⁄8 X 3⁄4".