In order to use the maximum opening space for the movement or transfer of large objects or items, doors are used in which both hinges open at the same time.

Similar to the opening double-hung window, this double-hung window also has a mullion, but with the difference that it is movable and when one of the sashes is opened, the mullion will also open with it. In the French window, only one of the sashes has a handle. The French opening mechanism is such that one of the latches is opened using a handle and the other latch (without a handle) is opened using an internal latch. A French window is a tall window with very large panes. Their design style is to make more parts of it transparent. The difference between a French window and patio doors or sliding doors is that instead of having a sliding mechanism, the French window opens inward or outward. French windows are double-hinged doors that usually open outwards. This type of window has many advantages for small houses, because instead of losing half of the space by using sliding doors, you can use more space by fully opening the French window.

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