StarTech.com 4U Steel Rackmount Server Case Black RMC4000I Protects PC components from physical harm in a secure all-metal rack-mounted enclosure Superior air-flow allows the PC to operate reliably in hotter environments Air filters prevent dust from accumulating in the system, improving reliability Rugged 1mm SECC steel construction Full front panel lockable protective door 120mm front fan with air filter provides plenty of clean air circulation. Can accommodate up to two additional 60mm fans in rear. Adjustable I/O card holders prevent cards from becoming unseated in their slots Temperature and fan failure LEDs warn of possible impending system failure