Here are the tips for the measurement of your different types of windows. You must measure each of your windows, even if they seem to have the same dimensions. The grommet curtains have a recommended gathering coefficient of 1.8 which makes it possible to form regular folds in the shape of a wave. So for a rod of 100 cm you have to take 2 curtains of 90 cm or 1 curtain with grommets of 180 cm. Bellow there is a table of correspondence between the width of the bead wire and the flat width of the eyelet curtains. The curtains with ruffle lace (ruflette, goblet, Flemish folds, vague folds) usually have a folding coefficient of 2.0. Thus, for a rod of 100 cm it is necessary to take 2 curtains of 100 cm or 1 curtain of 200 cm. There is a table of correspondence between the width of the rod and the flat width of the gathering curtains. Helpful tips for installing curtains and net curtains:

The rod must exceed the width of the window by 20 cm on each side
The rod must be fixed at least 15 cm above the window
In case of obstructions above or below the window (flap box, flange, radiator), provide long rod fixing brackets to carry it far enough from the wall so that your curtain can fall straight without touching these obstacles
For grommet curtains it is advisable to measure the height from the center of your rod. Thus, for a height of 230 cm between the center of the rod and your bottom point (floor, window sill, radiator) we speak of a curtain height 230 cm, although this cur...