automatic cold room door's structure is simple,it has reasonable selection and beautiful ... : 38~40PU thickness: 50mm,75mm,100mm,120mm,150mm,200mmquality: highSliding door internal polyurethane foam overall.Application industry:Food, industrial, supermarket, warehousing ... strong, plus box shell, the more enhance the overall effect.Door frame:Using aluminum alloy production, appearance is neat and easy ...