... layer300mm thickness fiberglass cotton insulation3Hearth304 SS steel, 2mm thickness, with necessary gap for hot stretching4Hot air duct304 SS steel, Branch ... of air fans to avoid burned3Fire flame310S SS steel made, speaker shaped, fixed with flange and SS steel screws on the burning ... 2Cr13, fan blade and shaft is 310S material, Taiwan made motor, cooling by air Multi-log furnace with hot log shear