The Comfort Stream™ is a high-powered, multi-port, utility or cooling fan. This is the only product available that is capable of being used as a "hybrid cooling system™" that works by drawing cool, outside, evening air through open windows, up throgh the attic and exhaust directly to the outside. Exhausting directly to the outside eliminates pressurizing the attic as traditional whole house comfort ventilators do, allowing the attic to be sealed while still allowing hybrid, differential cooling.