French windows can come in the style of casements or flush sash, they are great for when the width is limited but a means of escape is essential.
There is a minimum width for means of escape so if this minimum cannot be achieved with one side opening sash you can have a French window where both side by side sashes open fully without the obstructing central mullion (vertical bar).
You do, of course have the option to just open the master sash for ventilation purposes, you are not forced to open both sashes at the same time unless you need to.



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