The SR25UBSD3 25U SmartRack Shallow-Depth Rack Enclosure Cabinet houses equipment up to 27" in depth; ideal for storing shallow audio / video components and smaller equipment in areas with limited floor space. Constructed of steel with a resilient textured powder-coated finish, the SR25UBSD3 features adjustable mounting rails that accommodate up to 3,500 lb (1,588 kg) of equipment in 25U of rack space. To ensure your valuable equipment stays safe and secure, the side panels, reversible back door and reversible, removable front door lock to prevent unauthorized access. The front and rear doors are perforated, which allows air to flow freely through the rack to keep equipment cool. Vented top panels and an open bottom help remove warm air from the enclosure and draw in cool air by convention (they also support the installation of standard case fans, such as SRFANROOF). The SR25UBSD3 comes fully assembled with removable casters that let you roll the fully loaded enclosure to its desired location. Installing equipment within the enclosure is easy enough with its square mounting holes and numbered rack spaces. The front and rear vertical rails adjust in 1/4" increments from four to 27". Just unscrew the rails, slide them to the desired depth and tighten the screws. The enclosure supports toolless button-mount 0U installation of up to four compatible PDUs and cable managers. This makes cable routing to rack equipment easier and reduces clutter.