"North 1.1" warm doors for a cottage are made of galvanized steel with weather-resistant "No Frost" coating that prevents freezing and rusting of the door leaf. The longevity of the main trimming in direct sunlight conditions and precipitation exposure is ensured. Discoloration, the film swelling and other deformations of door leaf and coatings are ruled out. North 1.1 door is: - "Thermal-break" of door leaf and frame patented technology; - Two door seal contours; - High leak tightness of the door, which provides protection from odors and draft; - Heat insulation material inside the door leaf; - Area of ​​locks and hinges, that is reinforced by LVL (laminated veneer lumber); - Non-freezing aluminum threshold with thermo-insert, that protects against freezing.