In addition extend the width of the valance box approximately 10 on either side of the window.
Cornice board valance box.
The box pleated valance lands straight down over the window and is generally attached to the window with an l shaped rod.
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Doing so will make the window look larger.
Diy valance kit no sewing three styles in one kit fit all window sizes including bay windows reusable pattern no sew room decor bedroom living room dining room kitchen curtain cornice 4 3 out of 5 stars 29.
How to make your window look larger with a box valance.
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Remember to hang your cornice box as high to the ceiling as you can.