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My latest build is a Ryzen gaming/streaming/development build in this little case, the Masterbox Lite 3.1. The case sadly only comes with one case fan so I bought two static pressure fans from a well-known line and put them on my intake end to make the most of the small intake slits on the top and bottom of the front of this case. They worked great! Plenty of cool air quietly trickling in. The problem was the exhaust fan could never get hot air OUT fast enough during high load uses. I chalked this up to the un-identifiable and annoyingly rattly stock fan as just not being up to task and replaced it with an air flow fan from the same series as the intake fans. Slightly better at best! Then I found the real problem: the exhaust grill pattern on the back of the case ends a bit shy of where it should extend to accommodate the perimeter of a 120mm fan. The vast majority of air a fan pushes comes out as a ring at the very edges, and putting my hand on the intake side of the fan revealed that this ring of air was being REFLECTED BACK INTO THE CASE! My solution for now is mounting the fan on the exterior of the case and temps have dropped greatly at the expense of looking pretty weird and sound not being as dampened. I just wanted to post this here for potential buyers to know about this issue as it will require some modding to make the air flow work as intended in this case. Alternatively you could buy a smaller fan but all the great quality and selection is firmly in the 120mm range. As you can see in the close-up photo, the perimeter of the fan is mostly blocked on all sides! Mounting the fan outside solves this issue since it can create a vacuum to suck the air out without the ring of exhaust being blocked. I hope CM addresses this issue before manufacturing more of these as I'll be taking a drill to my new case to correct this, most likely.