Your VELUX Window carries a unique plate featuring a code that details the model and size of your window. For example GGL S06
What this code means...
The first 3 letters of this code refer to the model of the window - This will be in the form of 3 letters. For example: GGL, GHL, GPL, or GDL.
The next 1-3 digits of this code refer to the size of your window. This may be a mix of letters and numbers. Examples S06, 606 or 4. It is this "size code" that will determine the price of your VELUX Blind.