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The flange on a Concrete Masonry Unit (CMU) serves primarily to aid in lifting the block and to provide a larger surface for the bed joint. This design feature enhances the structural integrity of the masonry construction by distributing the load over a larger area, which helps to prevent cracking and other structural issues. The larger surface area allows for better adherence when mortar is applied, ensuring a more stable and durable bond between the blocks. Additionally, the flanged design provides a practical way for workers to handle and install the blocks more easily, promoting efficiency and safety on the job site.

Other options may suggest applications or enhancements that, while potentially beneficial, do not reflect the primary functional purpose of the flange in CMU construction. For example, aesthetics or increasing the block's weight are less significant concerns compared to the structural benefits that the flange provides. Additionally, while allowing for electrical wiring is a valid consideration in construction, it is not specifically the primary role of the flange itself.