sentences:  The exterior curtain wall aluminium skeleton holding the glass failed.Exceptionally sound cementitious spray fireproofing also helped to delay and ultimately to avoid the possible collapse of the building, by preventing the steel building structure from reaching the critical temperature at which steel weakens and can no longer hold its intended load.This fire proved the positive, collective effect of both active fire protection (sprinklers) to control fire size in its incipient stages, and passive fire protection (fireproofing) if the fire sprinklers are not effective.