Chimney is the producer of natural draught
Natural draught is the flow of air in a chimney or flue due to the difference in density between the hot gases inside the chimney and the cooler air outside. The chimney plays a crucial role in creating this natural draught phenomenon.

How a Chimney Produces Natural Draught:
- Temperature Difference: The hot gases produced by combustion in a furnace or boiler are lighter and less dense than the surrounding air. This temperature difference creates a pressure difference, causing the hot gases to rise up the chimney.
- Height and Length: The height and length of the chimney determine the strength of the natural draught. Taller and longer chimneys provide more space for the hot gases to rise, increasing the draught effect.
- Design: The design of the chimney, including its diameter, shape, and insulation, affects the efficiency of natural draught production. A well-designed chimney can enhance the draught by minimizing air resistance and maximizing the flow of hot gases.
- Wind Effects: Wind can also influence natural draught. When wind blows over the top of the chimney, it can either enhance or reduce the draught depending on the direction and intensity of the wind.

Advantages of Natural Draught:
- Energy-efficient: Natural draught does not require additional energy input, making it a cost-effective way to remove combustion gases.
- Reliable: As long as there is a temperature difference between the inside and outside of the chimney, natural draught will continue to work.
- Environmentally friendly: Natural draught does not rely on mechanical components, reducing the carbon footprint of the system.