Evaporative Cooling Media, Environmental Applications Residential/Commercial/Industrial, Height 20 1/2 in, Width 21 in, Depth 1/8 in, Pad Material Aspen, Pad Features Mechanical layering for uniformity in pad thickness and density, Biodegradable stitching which penetrates matting for stability, Each seam runs entire length of pad for strength., Replaces Part No. Champion/Essick 110088, For Use With Champion model WCM28 (1 pad needed);Essick model N28W (1 pad needed)