Ventilation is necessary in buildings to remove ‘stale’ air and replace it with ‘fresh’ air. These are done by the ways of ventilation systems and evaporative cooling systems, roof extractors and jet fan systems.

1. Helping to moderate internal temperatures.
2. Replenishing oxygen.
3. Reducing the accumulation of moisture, odors, bacteria, dust, carbon dioxide, smoke and other contaminants that can build up during occupied periods.
4. Creating air movement which improves the comfort of occupants.