Burning a dollhouse - a fun and educational way for a group of our new firefighters to learn about fire behaviour, flow paths, and "reading smoke".
Made from 7/16" oriented strand board (OSB), this prop is approximately 4 feet high, 16" deep and 32" wide. The four "rooms" plus attic space provide numerous options for ventilation openings and flow paths.
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The burn started with class A (wood & paper) fuel in the bottom left room, with class B (styrofoam & plastic) fuel added later to both illustrate the difference in how the two different classes of fuel burn (class A will burn fairly cleanly in ambient air with its 21% oxygen concentration, while class B fuels require a higher concentration of oxygen for complete combustion. A class B fuel fire is effectively ventilation limited in ambient air) and to show the effect on heat release rate, with class B fuels having a higher heat release rate than class A fuels.
Smoke is the result of incomplete combustion. The concept of "smoke is fuel" is illustrated at 1:40 and again at 1:48 when smoke at an upper window is ignited. Inside the dollhouse there is insufficient air for the smoke to burn, but once outside it mixes with air and at the right smoke/air mixture it ignites and burns readily. This is also why the flames at roof vent opening at 2:35 do not extend down into the attic space.
Despite being a consumable, single use prop the OSB dollhouses provide a decent amount of burn time - and nothing does a better job of simulating a fire in a wood house than a fire in a (miniature) wood house!
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