Vent systems are designed to allow air to flow in and out of buildings, ensuring proper ventilation. They help maintain indoor air quality by removing stale air, moisture, and pollutants while bringing in fresh air. Common types of vent systems include natural ventilation, which relies on windows and openings, and mechanical ventilation, which uses fans and ducts. In addition to improving air quality, vent systems can also help regulate temperature and humidity levels. Properly functioning vent systems can prevent issues like mold growth and excessive heat buildup, contributing to a healthier and more comfortable indoor environment.