COR 70 hidden wing with BT is a new window design European Channel hidden sill built with thinner profiles, only 66mm outwardly visible, increasing glass area up to 85% of the total, increasing room brightness.

Esthetically the system provides hiding of the sash on the outside thus making it impossible to distinguish between fixed and openable elements and resulting in a uniform facade design.

35mm thermal barrier and polyolefine foam insertion into the frame and sill provide up to 1,0 W/m²K transmittance, maximizing energy effiency. Besides the excellent thermal parameters acoustic insulation can also be improved by installing glass panes up to 40mm thick.

COR 70 hidden foil with BT has proven exellent results to AEV tests, creating a window with the best sealing, permeability and wind resistance, guaranteeing protection against the elements.