The Ventilating Fans Delta ITG70BT is a powerful and efficient fan designed for use in bathroom and utility rooms. With its 4-inch diameter duct size, it ensures proper ventilation without compromising space. This model, manufactured by the renowned brand Delta, offers a single speed option with an airflow capacity of 70 cubic feet per minute (CFM) and an efficacy rating of 10.6 CFM/Watt. Equipped with cutting-edge technology, this fan guarantees optimal performance while maintaining a quiet operation at just 1.0 sones. Its sleek design adds a touch of elegance to any room without the need for additional lighting as it does not come with built-in lighting features. Although released on the market on November 26th, 2015, this ventilating fan remains reliable and up-to-date in terms of functionality and efficiency. It provides excellent air circulation at low static pressure levels, achieving an airflow rate of 60 CFM at 0.25 inches water gauge