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Reveal Fixing -
Using the drawing , measure the reveal opening width at the top, middle and bottom. Taking the smallest width. For the height, measure the right, centre and left, from the window cill to the underside of the opening Again, taking the smallest height. 
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Select the expandable window barrier to suit the standard sizes:
900mm wide x 850mm high
900mm wide x 1000mm high
900mm wide x 1150mm high
900mm wide x 1300mm high
900mm wide x 1450mm high
1200mm wide x 850mm high
1200mm wide x 1000mm high
1200mm wide x 1150mm high
1200mm wide x 1300mm high
1200mm wide x 1450mm high
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