The APC NetShelter SX is a 42U server rack enclosure, one of APC's most widely deployed rack cabinet lines for data centres and server rooms, offering 600mm width and 1200mm depth to accommodate deep servers and networking equipment with room for cable management behind them. At 42U it provides substantial vertical mounting capacity for a full rack of servers, switches, PDUs and UPS units. NetShelter SX enclosures are built with a focus on airflow (high-perforation doors for front-to-back cooling), structural rigidity, and cable routing, and support APC's broader rack ecosystem of PDUs, cable organisers and cooling accessories. The listing doesn't specify load rating, door type, or included accessories, so those should be confirmed against APC's NetShelter SX datasheet for a specific deployment.