The following procedure is used for calibrating the heat leakage through the separating
partition alone, if the construction is not identical to the other five walls. A run is to be made as
described in 6.1.2.2. The temperature of the adjoining area on the other side of the separating
partition is be raised to equal the temperature in the heated compartment, thus eliminating heat
leakage through the partition, while the (11.1°C) 20°F differential is maintained between the
heated compartment and the ambient surroundings of the other five enveloping surfaces. The
difference in heat input between the first run and the second run equals the leakage through the
partition alone