Ventilation fans are devices designed to improve air circulation in indoor spaces. They work by drawing in fresh air from outside and expelling stale air, helping to maintain a comfortable and healthy environment. These fans are commonly used in homes, offices, and industrial settings to reduce humidity, eliminate odors, and enhance overall air quality. There are various types of ventilation fans, including exhaust fans, ceiling fans, and inline fans. Each type serves a specific purpose, such as removing moisture from bathrooms or circulating air in large rooms. Proper installation and maintenance of ventilation fans are essential for optimal performance and energy efficiency.