Rhino Ventilation looks like a decent brand considering that this is their specialty. Is is just a small number of plants you're dealing with, or a whole gackle of em?
Side note, my friend ducts his scrubbed air through his ceiling and outside through the eve sofit. Neat little professional/discrete looking cover too, you would never know unless working next to it. Not sure if something like thats an option, but figured I would throw it out there.
-Domo
Bookmarks