NoFlyStore lets you decide what measurements you will send upon configuring your fly screen; you can give the CLEAR DIMENSION, i.e. the measurements of the opening in which your fly screen will be installed, or the ORDERING SIZE, i.e. the exact measurement of your fly screen. When choosing, you will simply have to indicate, in the table regarding the measurements of your fly screen, which of the two measurements (CLEAR DIMENSION or ORDERING SIZE) you have opted for. In this regard, we would like to underline that, should you give us the CLEAR DIMENSION, we will carry out the required calculations, on the basis of the model you have selected, to establish the exact measurements of your fly screen; on the other hand, should you opt for sending us the ORDERING SIZE, no additional tolerance will be added, so the size of the fly screen will be the precise one you have indicated.