Should I use a fan or fume extractor for soldering?
Personally, I would always go for a fume extractor. For irregular soldering, most people don't use one, but really if you want to reduce the long term health risks then it is always better to get an extractor rather than just try to blow the fumes away. You could never be sure where the fans are actually blowing the fumes, the harmful chemicals could still be in the air. However, you can use all those fans to build your own fume extractor. 

There are lots of tutorials on YouTube and Google on how to build your own fume extractor for soldering that don't cost much money! This is the best way to do it in my opinion! Saves money and gives you a bit of a project to work on too