Arch. Stramien cvba Optimised safety and comfort Concept System® 77 is a high insulation window and door system that meets elevated requirements regarding thermal insulation, stability and security. The system’s HI+ variant achieves Uf values down to 1.2 W/m²K. The Uf value of a frame/vent section with 115 mm visible width is 1.7 W/m²K. CS 77 is available in a variety of aesthetic styles to match the current trends whilst offering all types of both inward and outward opening windows and doors. An additional asset is the possibility to combine this system with Ventalis®. The system’s performance regarding acoustics, water- and air tightness, but also for specific applications like Bullet - and Fire Resistance, meets the most severe European standards. Moreover, CS 77 is available in different burglar resistance levels (RC2 & RC3) making it an extremely secure sy

This table shows possible classes and values of performances. The values indicated in red are the ones relevant to this system. (1) The Uf-value measures the heat flow. The lower the Uf-value, the better the thermal insulation of the frame. (2) The sound reduction index (Rw) measures the capacity of the sound reduction performance of the frame. (3) The air tightness test measures the volume of air that would pass through a closed window at a certain air pressure. (4) The water tightness testing involves applying a uniform water spray at increasing air pressure until water penetrates...