... 3mm thick,tongue groove style,compound construction,anti-flame and heat-insulation, aluminium roof panel.Main doorFolding door, 3 folds ... intake centrifugal fan for exhaust air, 4 kw, air flow 12500m3/h in total.Purification systemPre-filter,600G high ... systemItaly Riello G20 Diesel Burner, 200000Kcal/h. Stainless steel heat exchanger ,argon arc welding.Auto-damper for changing spraying and baking ...