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Several calculation methods have been developed to predict ASTM E 84 Steiner tunnel test performance based on cone calorimeter data. Most of these methods have significant limitations because they were developed for specific types of products. This motivated the development of a more general mathematical model of the Steiner tunnel test. This paper describes the physical basis of the new model and illustrates its predictive capability on the basis of the experimental data that were obtained for twelve construction products with widely varying reaction-to-fire characteristics.