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Enjoy the peace of mind that comes with heavy duty security enhancements. The VELUX top-operated, centre-pivot burglary resistant roof window GGU Q is maintenance-free and built with integrated frame locks, extra strong hinges, laminated internal glazing and toughened external glazing which reinforces the window against any potential breakage. White polyurethane surrounding a thermally treated solid pine core Low maintenance Double glazed Window rotates 180 degree in its frame for easy and safe cleaning Ventilation flap lets in fresh air even when the window is closed