The Fontainebleau Series Thermal Break Casement Windows Adopt advanced vertical isothermal line alignment technology. The thermal break strips, sealing gaskets, and cavity insulation structures are precisely aligned along a single vertical thermal axis. This design completely blocks thermal bridges between indoor and outdoor environments, preventing heat transfer through convection in... https://www.eehewindows.com/fontainebleau-series-thermal-break-casement-window-product/