Before th box is installed the opening should be cleaned from dust and then be dampened with a spray bottle so that the foam can harden easier and faster. The mounting angles are bent out and the box is placed in the middle of the opening. The box can also be placed staggeredly or flushed in the opening, but it may not stick out of the wall more than 8,5 cm. Both graphite strips must be inside the wall.

Having placed the box in the right position the gaps between the wall and the box have to be filled completely with our EasyFoam mounting foam. These gaps may not be wider than 2 cm.