Eboli's MSDS sheet
http://www.phac-aspc.gc.ca/lab-bio/res/psds-ftss/ebola-eng.php
Most references to portable units I've seen refer to single use cells, drapes, bubbles, etc.
I'm not the expert, but isn't lvl 4 containment worrying about stuff that can be transmitted through the air? Everything I've read about Ebola is that it's not very contagious because it's fragile outside of the body and only transmitted through bodily fluids.
Of course, if you're studying a big batch of said fluids you'll probably want to take even more precautions.