A little off track as far as lampworking goes......I was in a goldsmiths shop a while back picking up some gold pelt. ~There he was at the bench with torch in hand working on a gold ring with a little bits of gold drops everywhere from melting off the excess.
I asked him if he used exhaust and his answer was NO.
I reduce the amounts of fuming I do with silver or gold and have made sure exhaust and make up air is all good. ~just remember the is negative side effects from working color as well. Too bad the soft glass manufacturers dont have the paperwork out there like Glass Alchemy does for the boro workers