ROOF CURB, FIXED, NON-VENTED, O.D 71"

ITEM: ROOF CURB,TYPE: FIXED, NONVENTILATED,CURB HEIGHT (IN.): 12,CURB SQUARE O.D. (IN.): 71,CURB SQUARE I.D. (IN.): 68,FLASHING FLANGE (IN.): 2,MOUNTING FLANGE SURFACE W (IN.): 2,CONSTRUCTION: 18 GAUGE GALVANIZED STEEL,USE W/DAYTON VENTILATORS HAVING A 72-1/2" SQUARE BASE,FOR USE WITH FLAT ROOFS ONLY,WEIGHT:230 LBS, IN BULK, MADE IN USA.