Fire in a Box · Lesson 02

Flow Path

You opened a door. What else did you change?

A door, a window, a stairwell, a change in wind: each offers a way to examine the movement of air, heat, and smoke through a building.

This class connects pressure and gas movement with compartment geometry, openings, and construction. Case discussions encourage crews to explain their expectations and reconsider them as conditions change.

Inside the conversation

• Pressure differences and movement through openings.
• Neutral plane, wind, and stack effect.
• Door control and flow paths through different building types.