For what use? There's a huge difference between removing a bit of flux vapor or fumes vs protecting yourself when doing potentially dangerous chemical experiments... For the former a simple Hakko activated carbon filter works just fine, at least for occasional use. I run it for a few seconds prior to soldering to get some airflow going, and that takes care of it. Even in a closed room it leaves nothing perceptible. The main reason to have something more elaborate is so you don't need to have it take up valuable space on your work bench, or if you do so much soldering the filter needs constant replacement - or it's simply overwhelmed. Just assembling prototypes I'm on the original filter still, after two years, but that's very light duty.