The 4U-K-439L is a perfect case for a cost-efficient Mini Server System. Using high-level material combined with excellent workmanship we created a variable and reliable industrial case. | So the 4U-K-439L supports ATX and PS/2 redundant power supplies, up to three 3,5“ internal devices, one external 5,25“ device and mainboards up to E-ATX size. | Furthermore the case has two 80mm fans and two USB 3.2 Gen1 front ports.