But what if we open the doors? The transition or “grace” period from a ventilation limited fire ( doors closed) to a well-ventilated fire (doors windows open) can occur from 1-2 minutes to a matter of seconds. The size of the structure will affect the grace period.
Answer: Control the door to control the fire growth. Have your attack line(s) charged prior to making any openings then control and coordinate those openings during the fire attack. If openings exist on arrival, control them.
In this case a bi-directional flow will have a slower fire growth potential than a uni-directional flow. In past years these showroom windows would have been taken immediately to evacuate smoke. In today’s flow path world they should remain intact.