Most fire engineers would be aware of how openings like doors and windows, the stack effect, and even wind can significantly alter fire outcomes. But there is a considerable difference between knowing that it does, and knowing how much that changes fire growth, size and the internal building environment. I've invited FSRIs dr Craig Weinschenk to discuss his years of full-scale research on fire flows.

In this episode, we discuss different conditions that occur once the flow is established at windows, doors or through HVAC systems. How it affects the fire's growth and spread, and what firefighters need to consider when taking decisions on venting a burning building. We underscore the importance of compartmentalization, discussing how a simple action like leaving a door open can drastically impact fire behaviour and smoke movement.

Although it is a side topic in the episode, perhaps a very interesting discussion is on the battery-initiated fires, discussing the various failure modes that can trigger an overpressure event or a jet flame. We also explore what batteries change in the fire environment when they are victims and participants of the fire (rather than the source). I know many will be interested in this, here is also a good read by Craig on the subject.

As with every episode with FSRI, there is A TON of resources to go through. Our recommendations:

• Public live stream of a fire experiment similar to the one I was invited to watch - this is the same series of experiments in the exact same building
• Search and rescue training course
• FSRI Materials Database
• Github - materials
• Github - public repositories

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The Fire Science Show is produced by the Fire Science Media in collaboration with OFR Consultants. Thank you to the podcast sponsor for their continuous support towards our mission.