I bought a 6" fan, something like Erik's, some flexible tubing and was going to hang it from the joists above my bench (basement solder-station) and run the tube out the window, simply remove one of the little basement windows replace it with plywood to which the hose would be fastened.
Problems.
1) Wife does her gardening in front of the window so all the lead-fumes would coat her gardening stuff.
2) Would need to work out some quick-change system for the window in winter.
3) Need a way to stop critters (squirrels, mice, voles, bugs etc) from crawling through the tube into the nice warm house.
4) I'm lazy, bought the stuff, haven't set it up yet; but now I won't due to problems 1 & 5.
5) Adopted a dog that runs through the yard, problem 5 is now problem #1.
Currently using a large desk-fan to extract fumes away from me, but I solder in the furnace room, so all I'm doing is getting the fumes away from my immediate work area,
where they then get redistributed throughout the house by the furnace poisoning my wife and dog, and me, still. See problems 1&5.
I posted this recently somewhere else in the forum, but can't find my post — nonetheless, here 'tis, a DIY fume-extractor article by The Tone God:
How To Build A Solder Fume Extractor Introduction Fumes given off when soldering are not good for one’s health. One solution is to use a solder fume extractor. The problem is that fume extractors are either hard to get or are somewhat expensive. This article is to show you how to build a solder...
www.thetonegod.com
There were some extractor suggestions in this thread (just 3 pgs):
Just curious what you would tell someone just getting started in pedal building to buy with a $100 Amazon gift card? I just placed a big Tayda order so I should be good on most parts. What about tools or specialty parts?
forum.pedalpcb.com
From that thread, Harry Klippton pointed out the lead doesn't make it into the fumes, but rosin-fumes aren't worth huffing either.
[EDIT Here's the desk fan, it gets moved onto the solder bench to the right (where the computer is in the pic) when soldering. Furnace is behind and to the left]