This black square shutter exhaust fan delivers 4800 CFM to quickly expel stale air, floating dirt, heat, and smells, keeping indoor air fresh in sheds, workshops, and attics. The intelligent controller features temperature and humidity triggers, offering up to 10 speed settings that automatically adjust to changing conditions, along with multiple modes, timer, and alarm for full control. Powered by a 75W premium EC motor at 1000 RPM, it provides airflow up to 21.3 ft/s while running smoothly with low noise, making it ideal for year-round attic ventilation. The all-metal steel construction offers high rigidity, deformation resistance, and handles damp and rain, providing greater durability than plastic alternatives and ready for harsh weather. The louvered design opens when the fan runs and closes automatically when off, preventing backdraft and keeping out pests and debris.