Designed without side or back walls around card cage area, E-Frame Chassis provides access for test and development. Unit includes carrying handle on top, front accessible test points, and monitoring LEDs for +3.3 V, ±5 V, ±12 V, ±24 V, and ±48 Vdc. With modular aluminum construction, tower can support up to 21 slots at .8 in. pitch or 17 slots at 1 in. pitch. Cooling is provided with three 150 cfm fans, which are speed-controlled with fan fail indication.