A French door typically consists of two door leaves (double-door) that open from the centre outward (or inward) giving a wide opening.
The term often implies generous glazing (glass) in each door leaf, so you get a lot of natural light and visual continuity between indoors and outdoors.
In the uPVC version it means: the frame is made of un-plasticised polyvinyl chloride (uPVC), and the design follows the French-door form.
For example: one manufacturer describes uPVC French doors as double-leaf design with large glass panels enhances aesthetics with natural light and sophistication.
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