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  2. Our rooflight sizes range from small windows, C2A (55x78cm), to large, U8A (134x140cm). The dimensions refer to the entire window including the frame. The system for rooflight sizes is a combination of letters and numbers. The first letter indicates the frame width and the number indicates the frame drop (or length).
    dakea.co.uk/articles/windows/rooflight-size/
    The VELUX brand window codes are found on the top right-hand edge of the roof window when you open it. The data plate tells you the type of window and the window size shown through the code. As shown below in the example, 304 would be 78cm x 98cm and the bottom window code 4 would be 114cm x 118cm.
    www.theskylightcompany.co.uk/velux-window-size…
     
  3. Roof window sizes and dimensions - VELUX

    Choose VELUX heritage conservation roof window, and contact us to learn about sizes, specifications and permissions. Are you uncertain if there is enough room to fit a rooflight? Don’t worry.

     
  4. VELUX Window Size Chart - Roofing Superstore Help & Advice

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