Sidelock absolute seal design 24" x 24" x 11.5" filter cartridges. Cartridge reorder information is; farr co. 49748g016, model 13xt-242412-1, s/n-532294, laser file 642, particle sizes .1-.15um, 1560 CFM @ 1.35 in. Wg 0% open, psl challenge. These units are unused in original manufacturers cartons. New filter msrp $367.00 each.