U4-423 has a 1U rackmount housing with a depth of only 360 mm (14.17 inches) and weighs only 3.2 kg, which saves a lot of space. It can be easily mounted without a rail, is suitable for most 2-post cabinets and wall-mounted small cabinets and can be used in a machine room, storage room, stairwell, office and many other places.... Suitable for small offices. Thanks to a high-quality, low-noise fan and a specially optimised internal structure, the U4-423 keeps the noise level relatively low even under full load.