I wouldn't call the simple fans useless - just the fact that the fumes are being blown away from your face is a huge improvement over not even having that.
Of course there needs to be somewhere for them to go, but if you can have an open window close to your bench, that solves that problem quite nicely.
Of course there needs to be somewhere for them to go, but if you can have an open window close to your bench, that solves that problem quite nicely.