Hi, I'm looking to start a sandwich store where everything is pre-made- ready to grab and go from an open display fridge. It is similar to "Pret a Manger" in the UK/New York. Temperature is crucial. I don't want them to 'feel' cold at all, but I do need to preserve the fillings inside. I want to preserve the integrity of the bread (and crunch) as much as possible. Sandwiches would only be in the fridge for a maximum of 6 hours. What is the minimum temperature to keep the sandwich fillings fresh? Any help would be much appreciated.