Special highly reinforced series made from thermally broken aluminium. Rounded edges, triple weathertight gasket and movable centre post. Allows for the addition of heavier and larger leaves (up to 3500 mm high and 1000 mm wide). Giving a thermic insulation, Uw=2,6 to 2,4 W/m2K. Depending on the glass used. Available with 25, 31, 37, 41 and 45 mm gaps for the incorporation of glazing or panels. Leaves open inwards, and can also incorporate one or more mid rails. Fitted with horizontal and vertical glazing beads. Series with optional flush-mounted or surface-mounted bottom track, bottom roller system, or stainless steel flush-mounted track. Includes U-shaped perimeter profile to correct minor misalignments. Optional incorporation of standard handles, business-type handles or threepoint bolt locks. Accessories are available in white, black and on demand, in the same colours as the profiles.