... wool board,the width of furnace chamber is 1130mm ,height of chamber is 200mm . 3)rated voltage: main furnace 25KWX6 groups,6 districts temperature ... use top-heat mode,material is OCr21AL6Nb,the top of furnace adopts folding chunking warm-keep material. 5)temperature control ... 2520si material dia 33x3x 83000mm 8)temperature of outside of furnace is less than room temperature+40 degree 2 Cooling ...