Internal: Stainless-steel (#304), Corrosion Resistant + External: Powder Coated steel + Inner Door: Inner Tempered Glass Door Shelf(Included): 2 PE-coated steel Wire Shelf, Load per Shelf : 16 kg Ventilation: 1 Ventilation hole with Stainless-steel Cap, Hole Diameter 40mm Safety device: Over Temp. and Over Current Protector, Sensor Error Detector