Unlock high-performance, energy-efficient attic cooling with the Smart Hybrid Solar Attic Exhaust Fan Pro. Featuring a powerful 50-Watt solar panel and cutting-edge German technology, this USA-engineered fan delivers up to 2850 CFM airflow-ideal for cooling and dehumidifying attics up to 4,000 sq. ft.. The built-in thermostat (40-104°F) enables automatic temperature-based operation, while the included 24-Watt hybrid adapter keeps air moving even on cloudy days and at night. Designed with a weatherproof, rust-resistant aluminum shell, this 2nd-generation upgrade combines low-noise performance, simple plug-and-play installation, and a brushless DC motor for maximum durability and efficiency. Reduce attic heat, improve HVAC performance, and extend roof life-all without adding a cent to your electric bill.