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Replacing French Door Glass It is relatively simple to replace a broken glass pane inside the French Door. Cleaning the glass trimming and molding, then removing the trim, then installing a new pane is all that's required. French doors have multiple glass panes, which are separated by muntin bars. They are also known as Mullions. They are available in a variety configurations and may include triple-pane glass to increase energy efficiency, decrease noise and control glare. How to replace a broken Pane of Gl