What are you burning inside the box? Fuel?

I have to fire helmets

My good friend and colleague Chief Ed Hartin has some plans for small scale models at the bottom of his resources page at cfbt-us.com/resources.html. Also have a look at kzbin.info/www/bejne/qmXCpIODhLOMqtE

Colleagues, what a great demo! Thanks very much for sharing this. I believe that the small scale demonstrations can be a great tool for reinforcing many of the fundamental principles of fire dynamics. Have you tried placing a board across the opening to show the impact of "anti-ventilation" like closing a door? You could also try small pulses of water fog into the over pressure to show that controlled application can cool the gases very effectively WITHOUT disrupting thermal balance.

Thanks for sharing! Interesting video.