In modern homes and buildings, maintaining proper air circulation and ventilation is essential for a healthy and comfortable environment. One of the most commonly used devices to improve indoor air quality and regulate temperature is the ventilation fan. Ventilation fans are designed to promote air movement, reduce humidity, and eliminate indoor pollutants, making them an indispensable feature in various settings, from residential homes to industrial and commercial spaces. This article explores the importance, types, and functionality of ventilation fans, highlighting their critical role in enhancing the indoor air quality and overall comfort.