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Sliding glass doors are wide doors with large windowpanes that cover a large span, typically as a patio door. The strength of the frame is critical in a sliding glass door. Typical doorframe materials are fiberglass, vinyl, aluminum, wood, vinyl-clad or aluminum-clad wood. Sliding glass doors are often used as patio doors and porch doors for an exterior opening. They are similar to a French patio door but are distinguished by the size of the windowpane. Thermal performance and gas fill are important considerations, as are draft and noise abatement.