By examining the results for cavity depth of 0.5, 1.0 and 1.5 m, it is found that a deeper cavity might give better safety under the scenario studied. The outer glass panel would be broken rapidly for the cavity of 0.5 m deep. Double-skinned façade with a cavity of 1.0 m deep appeared to be very risky as glass panels above broke most among the different cavity depths. The inner glass panel might be broken before the outer panel. This would give an undesirable outcome.
Other separation distances of the two skins should be further examined to give optimum design of cavity depth. Other factors affecting flame and smoke movement should be further investigated.