... cotton insulation3Hearth304 SS steel, 2mm thickness, with necessary gap for hot stretching4Hot air duct304 SS steel, Branch duct use 2mm ... indicate, automatic log moving and log loading8Air cooling system550w centrifugal fans cooling the driving shaft and bearings9Furnace doorsAutomatic open/ ... and shaft is 310S material, Taiwan made motor, cooling by air Multi-log furnace with hot log shear