Akust 120mm & 135mm & 140mm Air Ducting Thermalhood Case Fan Cooling Adapter 15.7 Inch 100% Air Flow Ducting for Cool Air in and Hot Air out Excellent Air Static Pressure to Optimize Cooling Flexible and Extendable Boot in any Angle and Direction Compatible with 120mm, 135mm and 140mm Case Fan Size Length: 15.7 Inch