Description
In determining the slat width consideration must be given to availability of the fabric as not all fabrics are available in both sizes, and the most suitable size to fit the window. Generally a narrow window reveal would be better serviced by 89mm slats, just as a wide opening such as a sliding door is better suited to wider slats. However, by virtue that you need more narrow slats o cover a window than wider slats, 89mm vertical blinds will usually be more expensive than 127mm.
Vertical blinds can also be installed “Inside Mount” or “Outside Mount”. In addition by using an extension reveal bracket they can be mounted somewhere in between.