This machine is for quickly preheating the short aluminum bar before extrusion. parameters:dimension of the rapid heating furnace: 4", 5" , 6", 7' , 8"total length of furnace equitment:21000mm,21500mm,21500mm,21500mm,28500mmlength of furnace:7700mm,9360mm9360mm,9360mm,12250mmlength of heating segment:3100mm,4600,4600mm,4600mm,6200mmlength of preheating segments:4500mm,4600mm,4600mm,4600mm, ...