Having too long of a duct on the hot air exhaust increases the back pressure on the fan which could cause it to prematurely fail, so [Vincent] used an extractor fan to automatically give is AC ...

Inline exhaust fans can also be used to move warm air throughout ... They maintain their advertised cubic feet per minute (CFM) air extraction rating over longer distances. Less ductwork and ...

Based on a standard 80-mm case fan, the extractor has a built-in 18650 battery for power and a USB charging port. There are nice little features, like a speed control and a low-battery indicator.