8.4.2.1 Air flow and regulation8.4.2.2 Temperature records8.4.2.2.1 Circular temperature charts8.4.2.2.2 Data loggers8.4.2.2.3 Temperature recorders in the load8.4.2.2.4 Manual temperature records8.4.2.2.5 Remote monitoring8.4.2.2.6 Conair or porthole containers8.4.2.3 Influence of stowage methods on the return air temperature