First, thanks for the inputs.
Second, I enclosed a photo for those interested. You can view here >>
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The installation partook last August and at that time, I didn't think about enclosing it. The installers and myself were discussing several location options and they thought it best where it is. I had to cut away the section of my deck in order to fit it there. I did not want it on top of deck for obvious reasons.
The square opening is roughly 46" on each side. You'll see the 4x4 posts which I already installed. The objective is to install the lattice and framing to the posts. At this time, I am now thinking of louvers instead of lattice. Whichever way I go, it'll be encased in a frame and most likely have eye-bolts to rest on L-hooks on the post, two per side, high and low for easy removal. I also plan to make a removable screen to rest on top during the fall and early spring when the Maple seeds drop, since many end up in the unit.
The framed enclosure (whichever I use), is roughly 6" from the unit. As you can also see, one side is facing the house, roughly one foot.
Viewing the picture is also facing south. We get a good wind coming from the west (right of picture) often.
I'm contemplating louvers since I believe it'll allow more airflow.
Anything I left out?