The QuietCool QC ES-4700 Energy Saver Advanced Whole House Fan is an innovative solution for home ventilation and cooling.Ideal for homes up to 2,098 square feet, this fan delivers impressive airflow with 4,195 CFM on high and 2,304 CFM on low. Despite its power, it remains highly energy-efficient, consuming only 415 Watts on high and 75 Watts on low, thanks to its ECM motor.This fan is a cost-effective alternative to traditional air conditioning, which can be expensive. By using cooler outdoor air, it efficiently cools and ventilates your home and attic, potentially saving you 50 to 90% on air conditioning-related energy costs. This not only lowers your bills but also contributes to a healthier indoor environment.The QuietCool QC ES-4700 also improves indoor air quality by continuously replacing stale indoor air with fresh outdoor air. This process helps eliminate pollutants, allergens, and moisture, reducing the risk of mold and mildew. When properly sized, it can complete a full air exchange every 3 to 4 minutes, keeping your home fresh and comfortable.What sets the QuietCool QC ES-4700 apart is its patented design with an acoustical duct and R5 damper box. This design minimizes noise and vibration, ensuring whisper-quiet operation even at high airflow. Enjoy a cool, comfortable, and quiet home with the QuietCool QC ES-4700, a fan that provides effective cooling, better air quality, and significant energy savings. Color: Green. Material: Galvanized Steel.