
A French door is a door comprising a pair of full-height casement windows. The main framing is detailed without a central mullion to allow easy passage though the doorway and each casement is fully glazed often with multiple panes ("lights").
The frame typically requires a weather strip at floor level and where the casements meet to prevent water ingress. An espagnolette bolt allows the head and foot of each casements to be secured in one movement. The slender window joinery maximises light though into the room and minimises the visual impact of the doorway joinery when considered externally.

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