If you are looking for a Porch Awning, we will need to know the straight aspect of the roof line measurement in centimetres (illustrated as 'L' below).
For Full Enclosed Awnings please refer to your Manufacturer's handbook for the 'A' measurement they state. We recommend that you measure this yourself to double check or refer to the Isabella website which has a comprehensive list of measurements - click here
If you are still confused give us call!