How to measure patio awnings:
When replacing awning roller tube or fabric, most cases you can
open your awning and on the roller tube it should have the brand and the model
number which is the easiest way to get the correct size and specific color if
replacing the same color.
the instance you are unable to get that model number; you can
always measure by specifying the center of arm to center of arm
NOT the length of the fabric or roller tube; also is there is a metal
weather shield with your awning and is there is color on both sides of
fabric (for fabric replacement).