Today, we are reviewing an air cooler from Deepcool; it’s an AK400. The AK400 is from the same family as the AK620 (a dual-tower cooler). The previous product of this type (air cooler) covered was the AS500, tested back at the end of 2020. It was so good (it earned the “Approved” award) that it stayed as a part of the chassis test suite. This time around, it’s also a single tower design cooler, with a four heat pipe tower layout, a unique matrix fin design, and a high-performance FDB fan that should provide excellent heat dissipation and low noise levels.