UV Stable, Rehau 60mm uPVC Profile System. 3 chamber profiles reinforced with zinc galvanised steel sections as necessary. Either single or double glazing option. Multipoint lock to master sash, shoot-bolt lock to slave sash. Double rebated, with EPDM seals for maximum weathertight performance. Our French windows can be opened outwards to give a full opening with no fixed mullion between the openers, which is ideal for fire-escape purposes. You can also choose to have restricted hinge openings to keep the children safe. ‘Easy-clean’ friction stays which open to 90′ are fitted to these windows. This makes the cleaning a little bit easier in those harder to reach places!