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VELUX GPU UK08 0068 White Polyurethane Top Hung Roof Window - 134x140cm Blackout Blind:Grey Blackout Blind What materials is the PlassonVELUX GPU UK08 0068 White Polyurethane Top Hung Roof Window 134x140cm With a VELUX top hung roof window the sky is the limit. An elegant handle at the bottom allows easy operation and VELUX top hung roof windows give you a full, open view of your skyline and maximise the amount of natural daylight that can be allowed in. As well as opening outwards for an unobstructed view and feeling of extra space, VELUX top hung windows also rotate 180 degrees for