MPPT Solar Power: Is your attic getting too hot? The 35W MPPT controller maximizes sunlight to extract hot air from the attic, with a cooling capacity of up to 3000 CFM. Our solar attic fan can significantly reduce your cooling costs and is suitable for metal and masonry roofs Efficient DC Motor: Reduces energy consumption. This solar roof fan is equipped with a brushless DC motor, providing a cooling capacity of up to 2400 CFM, perfect for keeping large rooms cool. Additionally, it is waterproof, ensuring reliable performance for many summers to come Energy Saving: Equipped with a built-in thermostat, the rooftop exhaust fan automatically starts when the attic temperature exceeds 26°C (79°F), maintaining a comfortable condition. It also turns on automatically during the day, without using any household electricity Weather-Resistant Panel: Our solar roof exhaust fan features an angled solar panel with multiple adjustable angles to maximize sunlight exposure