The characteristics of this box are the same as the AU3.2; the difference is in the inlets. The box has 2 branch inlets for D20 conduits. There are also 3 knock-out on the side, and 2 on the bottom. Made of halogen free material (IEC/61249-2-21) and fulfills the requirements of the glow wire test according to the standard IEC/EN60670: 2005 (850 °C).