A ventilation system is a setup designed to circulate air within a building, ensuring a supply of fresh air while removing stale air. It helps maintain indoor air quality by controlling humidity, temperature, and the presence of pollutants. Common types of ventilation systems include natural ventilation, mechanical ventilation, and hybrid systems. These systems can be found in various settings, such as homes, offices, and industrial facilities. Proper ventilation is essential for health and comfort, as it reduces the risk of respiratory issues and promotes a pleasant living or working environment. Regular maintenance is crucial for optimal performance.