This item consists of three Quiet Cool whole house fans for a total of 4500 CFM.

The Quiet Cool whole house fans are 100% made in the USA and come with a 10-year manufacturer warranty.

The fans work by pulling cool,  outside air inside through open windows and by creating a positive pressure in the attic,  which exhausts the hot air through the attic to the outside,  through your existing attic vents.  Whole house fans are used to both cool and ventilate your house.

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The best time to use whole house fans are during the hours when the outdoor temperatures are lower than indoor temperatures.  

In summer,  the air inside a home is heated during the hot part of the day. During the morning, late evening, and night, the outside air is often cooler and can be used to replace the inside air. Operating the whole house fans at these times will cool interior materials.   

As daytime temperatures rise,   the whole house fans can be turned off.   The cool materials (along with ceiling or circulating fans,   which create an additional cooling effect)  will help keep the interior more comfortable.