September 8, 20215 yr I am about to place an order for my windows and ready made window liner / cavity closers (like below) from different places. What clearances should i have between the windows to the closer? I was thinking 15mm horizontally and vertically so for a window has an outer diameter of 1100 x 1125mm including the cil the ready made window liner / cavity closers internal dimensions would be 1115 x 1140mm. Thoughts?
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