As part of a complete renovation project, I am designing the new bathroom. We are going for a wet room shower design and I have been able to find lots of information on tanking/tiling options etc. However, I haven't been able to find any good advice on the dimensions of the screened off shower area. The attached picture shows the general layout. The width is limited to 800mm because of the position of the door. I am looking at a wet room deck of either 800 by 1300 or 800 by 1500. If I go for the 1500, the main screen would be 900mm and the opening 600mm wide. Is 900mm likely to be enough to ensure that water doesn't wash out through the opening? Any pointers would be appreciated!