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## Two Unusual Phenomena in High-Rises Two unusual phenomena that sometimes occur in high-rises are the stratification of smoke below the top floors, and inverse (also called reverse) stack effect, which causes smoke to move down (see fig. 18-20, right side). The first phenomenon, stratification, m...

## Two Unusual Phenomena in High-Rises Two unusual phenomena that sometimes occur in high-rises are the stratification of smoke below the top floors, and inverse (also called reverse) stack effect, which causes smoke to move down (see fig. 18-20, right side). The first phenomenon, stratification, may occur in sealed buildings when the temperature of the smoke produced isn’t sufficient to cause it to rise to the top of the building. As smoke and fire gases travel through a building, they give off heat to the walls and their surroundings. The products of combustion rise.