It is easy to measure . We
need the open area measurements rounded to the closest whole
Length and Width.. You can mount the screen outside the ramp
door opening or inside it is up to you .
We add 1 1/2 inch to the length (pouch size) and 2 inches to the
width to what ever measurements you provide us for mounting .
The actual mounting loop fastener is 1 inch wide
measure twice we cut once.