Product review (2 stars): Beware the Inaccurate Instructions and Drawings
We ordered the UL02-W36 and are pleased with how it looks and functions now that we have it installed, but beware the documentation at XtremeAir's website and don't count on them responding to your emails.  Here is what I sent them with zero response:

 I was extremely disappointed in the quality of the instructions. Three primary issues, not in order of incidence:

First, the side mounting holes in the ceiling bracket and the matching holes in the top of the inside piece of the chimney didn't match. We mounted the the ceiling bracket in the exact corner of the ceiling, but when we tried to install the ceiling, we found that holes were mismatched by almost 1/8". In order to install the chimney we had remount the bracket with a 1/8" gap to the ceiling.

Second, either the chimney shipped with our product was the wrong one, or the drawings and information are lacking. The directions DO NOT MENTION that the chimney, as built, has about a 19" minimum height in order to accommodate the ceiling bracket holes. In order to mount the chimney in our space (about 17 3/16" tall), I had to cut three inches off the bottom of the inside piece and modify the top of the outside chimney piece so that it didn't interfere with the ceiling bracket. a 19" (or whatever the correct value is) minimum chimney height should be part of the specifications and described up front in the instructions.

Third, there were no instructions on installing the exhaust doors/vent adapter and the lower chimney bracket to the hood. It was not clear how that assembly was supposed to go together.

In the end, we're happy with what we have, but I can't recommend your product to anyone, since many would be likely to have a similarly poor installation experience and might not have the equipment necessary to be able to modify the pieces. In fact, in my case, I spent an additional $45 to buy an angle grinder and a cut-off disk in order to make the required modifications.