An inside mount is an application where the blinds/shades are mounted within the framework of the window.
Note: for Verticals, the height should be measured at four different places: two at each side of the window opening and two at the diagonals of the window. If the difference between the measurements of the two sides and diagonals are 3/8” or larger, Verticals are not recommended.
An outside mount application is where the blinds/shades are mounted on or above the window casting. Outside blinds/shades will be made to the dimensions recorded on the order.
On your notes, clearly indicate the width and the height – the width is always indicated first and the height is last (W x H). It is very common to transpose measurements.