Please explain the difference between inside and outside mount.

Simply stated, these terms refer to whether you will be installing your window coverings inside or outside the window opening. Inside mount means the blind or shade will be installed within the recessed area of your window opening. Outside mount means the blinds or shades will be installed on the wall surface outside the window opening, either above or to the sides of the window, directly on the trim or molding that surrounds the perimeter of the window opening or on a door (again, above or to the side). Outside mount blinds are usually used in windows that do not have enough depth to mount the blinds/shades or when you are trying to get better light control by covering the entire window. We recommend that you add 3 Inches to the height and width to allow room to install the brackets (minimum required space is listed in the specification section of each product) and give better light coverage.