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The smoke movement model developed at the National Research Council of Canada (NRCC) as part of its risk-cost assessment model is a simple computer model for calculating the probabilities of smoke hazard in multi-storey buildings. To validate this model, W-scale smoke movement experiments were conducted at the 10-storey experimental smoke tower at the National Fire Laboratory of the NRCC. The 10-storey tower was designed and built to study smoke movements in highrise buildings. Results of the experiments show good agreement between the data and the simple smoke movement model.