In structural fires, flashover is characterized by the rapid transition in fire behavior from localized burning of fuel to the involvement of all combustibles in the enclosure. Major parameters affecting flashover are fire growth rate, ventilation opening area, and room area. A comparison of flashover theories is undertaken using the Thomas, Babrauskas and the FASTLite theories, concentrating on the similarities and differences between the theories in their assessment of the major parameters affecting flashover.

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