My printer is on a shelf that is closed on 5 sides and I've added an exhaust at the upper back, which is tapped into my shop exhaust (8" inline blower). Even without blocking the main 8" exhaust line, a smoke test (larger particles than printing) showed a clear draw into the exhaust, from the upper bed area. I plan to add a plexi front door (no seals), at which point I'll have both a good directional exhaust and draft control.
If one didn't want to buy or make a fabric enclosures, it would be pretty easy to knock one up from "twin wall", which can often be had free from old signs etc.