We use rebate doors for less intrusion into your work area with heated door frames as required. Panel thickness is industry leading 100mm for maximum cold retention and room rigidity. All panels cam lock together from inside the room. The floor is 5 bar aluminium tread on top of white coated steel. Cold room shelving is by Fermod with a 10 year warranty and 100% food safe, will not rust, fade or break with all normal use.