Maximum Heat release=weight of Combustible matter× its heat of combustion.

In a common structure, the fire load comprises of the combustible matter, floor finishes, interior finishes and the structural framework. Fuel load is usually given in terms of the average fire load;

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The fire load =combustibleweight/firearea ∈ squarefee

When NIST tests were analyzed, they showed an approximate correlation between the Fuel load and an exposure to a fire severity equivalent to the standard time temperature curve.

The weight per square foot (m2) of ordinary combustibles such as wood, paper, and comparable materials with a heat of combustion of 7,000 to 8,000 Btu per pound (16,282 to 18,608 J/Kg) was related to hourly fire severity, as described in Section7/chapter 5/ Table 7-5a/page 7-79 of the NFPA’s Fire Protection handbook.