This study presents an experimental investigation of fire and smoke propagation through a window opening facing an internal patio (vertical void) in a high-rise building (HRB). Experiments were carried out on a 1:4 scale model composed of two superimposed compartments of identical dimensions (1.23 m × 1.23 m × 2.0 m). Each compartment was equipped with a front window (0.25 m × 0.25 m), while a door measuring 0.50 m × 0.25 m was installed only on the left side of the lower compartment. Two configurations were analyzed: a building with an internal patio (CIAP) and a building without a patio (CISP). Using kerosene as the fire source, a comparative analysis of smoke and hot gas propagation was performed. In the CIAP configuration under windless conditions,[…] Read more at https://mjcellpress.com/article/mjes08/