The AUS74 is a front-mounted mounting box with telescope bottom part for board walls of 1 – 3 gypsum boards ( thickness of the wall 9 – 39 mm ). The height of the box is 54 – 70 mm thanks to the moving bottom part. The installation hole diameter is 73 - 74 mm (box drill AT4). At the side of the bottom part are three inlets for the 16 mm flexi pipe. There is also one inlet for the 16/20 mm and one inlet for the 20 mm flexi pipe. There are two inlets with strain reliefs on the bottom of the box for installing 8 - 13 mm cables and two inlets for the low voltage cables. Box combinations can be made both horizontal and vertical directions without any extra parts. The box has four openings, one on each side, through which conductors can also be conveyed from one box to another. At the top of the box there are two fixing places for screws to install it to the log wall. At the bottom there are marking holes for making box combinations (c/c 71 mm) . The protection class is IP3X. 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).