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Replacing French Door Glass It is relatively easy to replace a damaged glass pane on a French Door. It involves cleaning the pane of glass, removing trim or molding, and putting in an entirely new window pane. French doors feature multiple glass panes that are separated by muntin bars. They are also referred to as mullions. They are available in a variety configurations and can include triple-pane glass to improve energy efficiency, decrease noise and reduce the glare. How to replace a damaged Pane of Glass We