Roof window 55x78 cm Tondach Project. Made of an impregnated wooden frame covered with a colorless acrylic coating. External profiles in anthracite-gray aluminium. Central opening axis. Bottom opening handle. Ventilation valve with a capacity of up to 31 m/h. Standard double glazing with argon. U of the frame = 1.3W / m2K. U of the glass = 1.1W / m2K. Noise insulation - R of the window = 32 dB. Warranty 10 years when using Premium flashing.