It is easy to measure . We need the open area measurements rounded to the closest whole number
Length and Width.. You can mount the screen outside the ramp door opening or inside it is up to you .

Note:
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

Remember! measure twice we cut once.