Noctua displayed a new low-profile, top-flow CPU cooler prototype, that's capable of low-profile mode with a height of just 66 mm, making it fit for certain slim form-factor ITX cases. The prototype uses a C-type top-flow heatsink, similar to the NH-C14, only much smaller, and thinner. It uses four heat-pipes to convey heat to a dense aluminum fin array. Unlike on the NH-C14, this prototype uses a dual-fan design in which the bottom fan is smaller. While the top-fan is a 120 mm Focused Airflow, while the bottom fan is a 92 mm NF-B9. The cooler can be run in dual-fan mode with both fans installed (cooler height will be 91 mm), or single-fan low-profile mode with the top fan removed (cooler height of 66 mm). A "high-clearance mode" with the bottom fan removed also looks possible.