... unit Use 100%polyurethane insulation panel, density about 44~46kg/m3, with gasket, with flame retardant. Panel thickness: 100mm, ... available..-- insulation panel: Polyurethane (density is up to 40~46kg/m3 ) Application: Food(meat, vegetable, fruit, dairy, drink), medicine, ... can be with painted steel sheet and stainless steel sheet for choice.-- with electric heating wire around doorframe to void ...