The MB-79N system is an economical window and door system that meets more stringent standards for thermal and acoustic insulation. It is the successor to the widely used and highly popular MB-70 system. Its high strength and durability create extensive architectural possibilities. It is used to manufacture a wide range of joinery, including fixed, casement, tilt, and sliding windows, single and double exterior doors, and shopfronts with doors. The system is available in several variants: the efficient MB-79N E, with a single-component central gasket in the windows; the MB-79N ST version with a two-component central gasket; and the MB-79N SI variant with the best thermal insulation, featuring profiles equipped with insulating inserts and a two-component central gasket.