QuietCool Advanced Whole House Fans Are Used For Whole House Ventilation In Residential Applications. QuietCool Advanced Whole House Fans are made of steel, insulation and sheathing for long lasting durability. Whole house ventilation allows you to bring cooler oudoor air through windows and attic space for home comfort. The process of thermal mass cooling allows the home to stay cooler the next day and resist heating compared to only running an AC at home.Acoustical duct attached to a dampler box provides quiet operation and virtually no noise vibration. The EDM energy saver motor uses small amounts of power while moving large amounts of air for increased effieciency. Diameters are available in 14-12", 14-38", 16-1-2" and 18-1/2". Watts range from 30 to 703. Available in 120 volts. CFM High varies from 1452 to 6328. Other specifications vary per model.