The construction of Alutech sandwich-panels 45 mm thick ensures high resistance to wind and impact loads:

1. Both outer and inner steel sheets of the sandwich panel are interconnected in the top and bottom of panel. This eliminates separation of the panel while heated in the sun which is essential for the South regions and for the doors of dark colors;
2. The panels configuration ensures their self-centering. It guarantees close adjoining of the panels to each other, increases their tightness and thermal insulation. It significantly facilitates the installation and eliminates errors while the assembling of door leaf.
3. Attaching points of self-tapping screws are located in the junction area of external and internal sheets (4 metal layers). It makes the fastening stronger which completely excludes slackening and distortion of hinges. Sound interconnection of steel sheets makes impossible the separation of panels in case of sudden lowering of the door.