Nice at the moment, I just am using cardboard cut to size to blank out places to focus the airflow. I think with this addition, I might rearrange my rack to redirect air through the new box. Once I get my hands on it, I'll better be able to think about how I might do that, I might actually go as far figuring out a 3D print rackmount adapter for it to make sure the hot air gets exhausted properly.I run a HP 6300 Pro for my opnSense box. Uses about 25w with an extra dual port and single port NICs added in. I have a 4 post rack, I just have a shelf for the PC to sit on and am in the process of making a custom blanking plate to go around the front to keep airflow proper in the rack. Either just gonna get a piece of Plexiglas or something similar. I'm also in the process of figuring out how to hook the rack up to an outside air duct that I have. I want the heat to go out it in the summer but reverse it and bring in the cool air in the winter while dumping the heat to the house. Fun projects.
I also would love to find an easy way to mount some fans along the front of a section of my rack to force more air into the case.