The unique design of the Dual TopFan was inspired by ceiling fans; with the goal being to create a minimalistic fan housing structure that would incorporate 2x 120mm low speed fans to help draw warm air out of the upper section.
The Dual TopFan sits on a flange that's attached to the inside of the top of the Unibody. It's the same flange used for the Serpentine Topgrill so the two parts are easily interchangeable. Once in place, the fans are powered by plugging in its 3-pin connector to an adjacent power header on the motherboard. Dust is not an issue while the Dual TopFan is operating, but in the event of prolonged periods where the machine is not in use, it’s recommended to cover the opening at the top of the case.