... polyethylene sliding wheels, low temperature rubber seals, the main pieces of molded stainless steel, aluminum rail accessories, pretty ... resistant, easy to open and close, internal and external switch, maintenance is simple,4 .the installation of low-temperature doors ... . to install anti-collision plate, door thickness of 50mm, 75mm, 100mm, 150mm, 200mm2.-10 °C Following the installation of electric ...