Discussion is presented on the following items of the report. (1) Description of building conditions with regard to the report of effective infiltration area Needs of the description of building conditions influential to the effective infiltration area are pointed out for the improvement of the predictability of the infiltration area at the fire safety design of commercial buildings. (2) Reported smoke layer interface height in the fire initiation room The smoke layer interface height in the fire zone just after the ignition reported in Figure 3 (a) is too low, which is probably attributed to the innocent application of the N% principle to the temperature profile in an originally thermally stratified fire room.
