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Replacing French Door Glass Replacing a broken piece of glass on a French door is a simple DIY project. It involves cleaning the glass pane and removing molding or trim, and putting in the new window pane. French doors feature multiple glass panes, separated by muntin bars for functional purposes, also known as mullions. They are available in a variety of styles and can include triple-pane glass to improve energy efficiency, cut down on sound and control glare. How to Replace a Broken Pane of Glass Before yo