6U Berta rack mount chassis is the most reliable and practical 20-slot industrial chassis for 19" racks. It has Air Chamber (C) optimized air flow and built-in temperature control for longer life of your system. The high quality chassis is precision designed and manufactured with CAD-CAM robotics in our own Metal Shop. We have total control of air flow, electrical and EMI protection. This chassis has been a long time favorite of many telephone system integrators, digital imaging OEM's and militaries who use high speed DSP type I/O cards. It has capacity for up to 20 ISA and/or PCI backplane slots.