ARCHED WINDOWS DIAMETER/TRAVEL LINE:
Measure the exact distance “D” from each outside edge of the window frame (Figs. 1 & 2).

CENTER LINE/RISE: Measure the line “C” from the center of the diameter (travel line) to the top outside edge of the arch frame (Figs. 1 & 2).

SQUARE/RECTANGULAR WINDOWS:
Measure the exact width “W” and height “H” from outside edge to outside edge of the window frame (Fig. 3).

DOORWAY/CANOPY ARCHES:
Measure the diameter (travel line) “D”, the center line “C” from the center of the diameter, the overall length “L”, the height “H” and the width “W” (Fig. 4).