The most common reason the website might not accept your dimensions is if they’re not entered in millimetres (mm), as our system requires measurements to be in this unit to ensure your blinds are made to perfection.
Another possibility is that the dimensions you’ve entered may be outside of our maximum or minimum size limits for that product. If this happens, a size search button will appear, and by clicking it, you'll be directed to the products available in the sizes you’ve entered.