This photo provides a close-up look of the treated portal from a different angle along with a detailed view of a standoff. The standoffs position the line about 1" out from the portal. Initially, I set the lines vertically about 3/16" on either side of the entrance hole, but have now reduced it to 1/8" to 3/16" inside the edges of the entrance hole. Horizontally the line is even with the top and bottom edges of the portal. (Borrowing from another plan) the distance from the bottom of the hole to the bottom horizontal line is important--2 5/8 inch.