I get 'agitated' when I see stuff like this (I hope to God no one was injured in any manner). I've got a degree in chemistry and I don't fuck around when I am experimenting at home (read extracting, purging, boiling, evaporating or whatever).
If you need to vacumn purge, get a water tap adapter. Doesn't require electricity.
Evaporating a large amount of butane, ISO or whatever? Gte an isolated room with a window. Open the window (or better yet screen door). Place the pan/container near the open window/door and have a fan 5/6 feet away at a slightly higher elevation than the solvent.
For good measure have a first aid kit and fire extinguisher handy.
Yeah, yeah I know Tom; it's common sense. Well, if it's above your skill level DON'T do it
Tom