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For the North American market we offer our tilt turn window with a nailing flange (also referred to as a nailing fin). The aluminum cladding wraps around the window and transitions into the nailing flange for continuous protection of the wood frame and sash facilitating a quick and simple installation and proper air and moisture sealing of the rough opening. Also available is the flange-less configuration popular in the rest of the world which is ideal for masonry openings.