James
Senior Member
Sidewall venting is trickier and there are more design considerations involved so it makes sense for them to exhaust it the way they did here. If you've seen some sidewall vent installations, the side of the building around the termination tends to be all stained. In general, you also can't sidewall vent directly above a public space. Condensation could also drip out. It's much more limiting than just running them straight up and out.