The second-generation hardware conceived by the Open Compute project, dubbed Winterfell, is being installed in Building Two of Facebook's Prineville complex. This image shows three of the elongated Winterfell servers side by side in a 2U tray that can slide in and out of the rack for servicing. The front is open for better air passage. The components are aligned in parallel for air flow, and two small fans at the rear of the motherboard draw cooling air across the server. The warmed air then exits into the hot aisle, where it's collected and expelled from the building or remixed with chilly outside air.