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Aluminum bifold door from Kesenbao, offered in a 5-panel version and customizable from two panels or more as needed. The number of panels is determined by the maximum width and load-bearing capacity of the frame, which allows optimal use of available interior space and creates large openings to the outside. The manufacturer offers several custom glazing options, including low-emissivity glass and multilayer glazing with argon gap. The door is equipped as standard with double-cavity tempered glazing/triple glazing, combined with a multi-cavity foam composite spacer that improves sound insulation. The frame is designed with a thermal break to limit heat loss, making it suitable for cold climates as well as areas with large temperature variations. Profiles are robust aluminum and the coating resists corrosion and fading; maintenance is limited to routine cleaning. These doors are intended for villas, apartments and projects seeking a smooth transition between interior and exterior.