The first letter identifies the type of container: "F" for front opening or "T" for top loading version. The following four numbers indicate the gross internal volume in liters. The next three (or four) letters indicate the model version:
"NDN" are the models not suitable for the transport of frozen products;
"FDN" are the models suitable for the transport of frozen products;
"XFDN" are special deep freezing models.
The "NDH" and "FDH" models have automatic cooling/heating systems able to maintain the internal temperature constant regardless of the outside temperature.
As an example, the F0720/FDH model is a front opening one, with an internal gross volume of 720 liters and the possibility to set the internal temperature between +30° C and -24° C.