One of the rooms in the basement I'm finishing has some duct work that runs below the joists, and would be a pain to drywall around. So, I'm considering a drop ceiling, but would like to avoid losing the 12"+ of ceiling height in the rest of the room. Basically, I'm wondering if it's possible to install a 2-level drop ceiling. Logistically, it doesn't seem like it would be all that difficult, I'm just not sure if they make anything to accomodate vertical ceiling tiles. Anyone know if I can do this?