... traditional metal one and sealed to resist dust going inside, with fire and corrosion resistance, and easy for cleaning and ... Elegant design without any screws. 3,PTC heating element is with safe non-conductive surface, overheatprotection,high efficiency,waterproof,dustproof. 85oC ... , overload protection, and long life-span. 6, ,Air speed is with High,Mid, Low three switch of speeds, you can choose ...