1" Deep Micro Perf Door for 44RU FMA, 100, 200, 500, and 700 Series Racks. The Atlas Sound MPFD44 vented rack door is designed for use on the 100, 200, 500, 700 and FMA series cabinets. The MPFD series combines the benefits of vented cooling with the ability to see LED's, TFT's or CRT's housed in the rack via the integral perforated steel mesh panel. A 16GA metal door frame provides exceptional strength to the door assembly.