Add 3 to 6 inches of "overhang" on each side of the frame. This allows curtains to "stack back" when open, maximizing light and making the window appear wider.
The rod's thickness (diameter) determines its strength and visual impact. 7 Tips For Choosing Curtain Rods | Curtain Rod Guide | DRD how to buy curtain rods
To determine the correct rod length, always measure the , not just the glass. Add 3 to 6 inches of "overhang" on each side of the frame