The opening, hopper-opening, hopper-sliding and swinging doors are mainly made of three chambered IMPERIAL system. The heat transmission coefficient of the profiles is: UR=2,2 - 2,3 W/m2K, based on which they can be classified into 2.1 frame-group accordant to DIN 4108. The profile depth of the door frames, dividers and door leaves is 65 mm. The profiles’ wall thickness is 1.7 – 2.0 mm, so the doors of greater length and width also have good static properties. Many types of doorstep, hinge, glass lath, lever-handle and lock are available. The glass thickness can change between 4 and 51 mm. LUXUS systems are recommended for exclusive demands, and STEEL LOOK system for steel structure imitation. For greater heat insulation demands we recommend the 75 mm profile depth SUPERIAL type doors. UR=2.0 W/m2K. The thermal bridge ECONOLINE profile family is suitable for indoor usage.