Thanks for checking that out! So, I just checked, that would mean the heat shield would have to protrude from the surround about 5 1/2". That's gotta be kinda ugly...not that there's much choice. The clearances on the Hampton are better, but... Actually, where did you see the 24" number...I keep seeing 27". That 3" would make a big difference considering the geometry of my mantle. Here is where I saw 27", under documents, schematic.