On Thu, 14 Jul 2016 11:58:52 -0400, FrozenNorth
wrote:

Your install may have been no different vs. a standard window, but that wouldn't be the case
in Snuffy's situation. He is planning on using a garden window that is bigger than the
existing window. i.e. it will mounted (somehow) to the exterior wall, not mounted in the
window's RO.

You are right, I missed the over an existing window part, ours was made
to fit the existing RO.

Snuffy could enlarge the RO and mount the garden window securely. I'd
not mount it outside on the wall and expect it to not leak and move.

....just sayin'