Lumon retractable terrace glazing are glass walls for your terrace or patio that slide easily along a low track and fold open. The innovative system means that you can have a fully protected sunroom or terrace, an open and breezy patio space, or a partial windbreak – simply by positioning the glass walls in different ways! Lumon retractable glazing is easy to use. Simply use the handle to open the first panel, and then slide the remaining panels along the track and fold them open against the first panel.