Door panels made of aluminum, 36-mm thick (or 77-mm for the MB-86SI system flushed on both sides) are Drutex original solutions. They consist of two layers of 2.5 millimeter aluminum sheets on both sides of the door. Inside there is XPS foam divided by 1-millimeter aluminum sheet. This cutting-edge solution determined great energy efficiency and strength parameters of Drutex doors. The 28-mm thick glass (or 70 mm for the MB-86SI system flushed on both sides) applied in these solutions are exclusively own-produced. In the MB-86SI system there is a possibility to flush the panels with the door sash on the outside and on both sides.