I am an OH&S student and would like some help with an Engineering issue. Please accept this request calculating weather this roof collapse could be controlled by the internal fans. I am trying to calculate whether this roof deflation was a "Controlled Deflation". The roof collapsed in 2 minutes and 30 seconds. I believe the size of the missing panel caused the roof to collapse in a rapid and uncontrolled manner.

http://www.youtube.com/watch?v=yLZ6XD-RpHM

How can I prove this? With the size of the panel, the internal pressure and the capacity of the fans.

John