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Replacing French Door Glass It is fairly simple to replace a damaged glass pane in the French door. Cleaning the glass trimming and molding, then removing the trim, then installing the new pane is all that's required. French doors feature multiple glass panes, which are separated by muntin bars. They are also known as Mullions. They are available in a variety of styles and can also include triple-pane glass to increase energy efficiency, cut down on sound and minimize glare. How to replace a broken pane