... from rear upper, quadrate steel frame, with heat preservation material filled in.Intake systefree air speed≥ ... burner, heating productivity is 180000kcal/h, stainless steel heat exchanger, Max. working temperature is 80°C, pneumatic damper ... filter), floor filter(fiberglass filter). RoofGalvanized steelControl systemspraying, heat spraying, baking, time setting, lighting switch, temperature controller ...