Aluminum folding windows are an innovative type of door and window product equipped with a multi-sash linked folding hardware system. Their core feature is that, through the coordinated operation of hardware components such as hinges and rails, multiple sashes can be folded and retracted horizontally. When opened, they can fully expose over 80% of the window opening area; when closed, they achieve tight sealing through a sealing structure. These windows combine advantages including “ultra-large opening, flexible space utilization, and excellent appearance”.