Ventilation systems are designed to improve indoor air quality by circulating fresh air and removing stale air. They help control temperature, humidity, and the presence of pollutants, making indoor environments healthier and more comfortable. Common types of ventilation systems include natural ventilation, mechanical ventilation, and hybrid systems, each serving different needs and building designs. These systems can be found in various settings, such as homes, offices, and industrial facilities. Proper ventilation is essential for maintaining a safe atmosphere, especially in spaces where chemicals or equipment may produce harmful fumes. Regular maintenance ensures these systems operate efficiently and effectively.