What Are The Window Fit Dimensions?

The “window fit” dimensions refer to the dimensions of the window frame designed to fit into the provided opening. This measurement is typically reduced by 1/8” to 3/16” per side from the actual hole opening to allow for proper clearance during installation.

The window’s exterior dimension, often referred to as the “flange dimension,” represents the outermost edge of the window frame once it is installed. This includes the mounting flange and helps understand total coverage and ensure compatibility with trim or siding.