Another most essential thing which you need to know about the vertical louvers is that the larger the louvres, the greater amount of light would be entering the room. Moreover, the color of the blade would also be influencing the amount of light reflecting. Therefore, it is very important to consider having lighter colors if you are going for small louvers.
If you are having a small window then consider having small blades or slats as they would look much better. Similarly, for larger windows, larger blades or slats would be best. Small blades on the larger windows would look cluttered and it would be obstructing too much light and view.
There are huge numbers of options available for the vertical louvres. They are available in various kinds of fabrics and colors. So, if you are considering buying vertical louvers then buy them from a good and reputed store.