The door is constructed of a core of 140 millimetre insulation material, covered with polyester on both sides and finished with anodized aluminum profiles all round, free of thermal bridges. Executed with a drop/lift-rail system and available in both a horizontal (single and double leafed) and a vertical design. The doors are equipped as standard with frame heating in the door frame and optionally a heated threshold. For specific situations you can opt for extra heating in the door leaf. Another option you can opt for is a threshold with a gliding dowel construction, a long-term solution that keeps the inside and outside floors at one level and realises a controlled shrinkage.