DescriptionWhole House Attic Fan: This fan is designed to cool and ventilate entire homes by exhausting hot air from indoor spaces. It features a smart digital controller with temperature and humidity trigger programming, fan speed control, timers, and alarms. The fan utilizes a PWM-controlled EC motor, resulting in quieter and more energy-efficient operation than most other fans. Unique Features: The fan is equipped with two-door shutters with a damper that blocks attic air from entering living spaces when the fan is not in use. The duct size