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Amber marks the upper gas zone. The dividing line is a two-zone model interface, not a visible smoke edge. Color and opacity do not represent smoke visibility. Furniture is context only.
A separate CFAST model. Free play remains unchanged.
The two packaged nominal gas-burner runs prescribe zero soot and carbon-monoxide yields and record zero optical density and CO. They cannot validate smoke visibility or toxicity. Zero values do not establish safe conditions.
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- Upper gas
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- Lower gas
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- Layer interface
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- Burning HRR
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Fire size: the burner is fixed at 250 kW, about 5 to 14 percent of the sofa peaks in the Free Play reference table (1.8 to 5.2 MW, NIST Fire Calorimetry Database). These readings do not describe a furniture fire.
Model predictions, not measured house conditions. No safe-entry, ventilation-tactic, structural-failure or tenability conclusions.
What this run assumes
Openings are fixed for each run. Changing an opening starts a different precomputed scenario; no live solver runs in your browser.
Oxygen is plotted as wet volume percent, so ambient reads below the familiar dry-air 20.9%.
Sources and independent comparisons
Compare CFAST with FSRI chamber observations
NIST CFAST documentation
FSRI benchmark report
Pinned experimental data
First step: one prescribed gas fire in one compartment. Automatic furniture ignition, room-to-room spread, smoke visibility, wind and structural strength are outside this model.