... parts galvanized screws all, reinforcement corrosion-resistant, easy to open and close, internal and external switch, maintenance is ... simple,4 .the installation of low-temperature doors imported heating wire, the -40 ° C without freezing,5. size 2500 ... to install anti-collision plate, door thickness of 50mm, 75mm, 100mm, 150mm, 200mm2.-10 °C Following the installation of electric heating wire system ...