Bi-folding door unit. 1 right / 4 left. 2400mm tall & 4000mm wide.Viewed from outside, doors outward opening. Steel frame window & door unit. Precision hot-rolled in Switzerland. Corrosion control after fabrication. Includes all hardware and fittings. Glass is supplied & fitted on-site by others. Available powder coat finished matte black or prime painted ready for top-coat painting on-site by others. Either single or double glazing versions and can be joined to all other standard range units to form unique combinations and larger openings. 10 year warranty.