Chimneys function based on the principle of convection and air pressure difference. When fuel burns, the hot gases and smoke produced inside become lighter and rise through the chimney. As this hot air moves upward, it creates a low-pressure zone at the base, which draws in cooler, denser air from the surroundings. This cycle, known as the draft effect, ensures a continuous upward airflow that carries smoke, heat, and gases safely out of the structure. The taller the chimney, the stronger this d