COMBUSTIBLE FLOOR BASE, FOR USE WITH:DOWNFLOW FURNACE AND COIL ONLY, MATERIAL:GALVANIZED STEEL, INNER DIMS:15" X 13-1/2", OVERALL DIMS:3-1/2"H X 15-3/4"W X 20-1/2"D, WEIGHT:7 LBS, IN MFG BOX.(ADDITIONAL #:45-180-56B)