Originally Posted by beachguy005
. . . but I just set them in a bed of construction adhesive, top and bottom, caulked them all around both inside and out, and never touched them again.
which means whatever forces on these from animals and day/night temperature change wasn't enough to dislodge them.
With search time, travel time & whatnot you will use up by buying commercial, you may pay yourself a goodly sum per hour by making them yourself. Stain or paint?
Just don't assume one vent size fits all your openings. I'd first make a four piece mockup frame and check how well it fits or doesn't fit. If it fits, how much clearance do you have? Is it uniform?