When you have 50 circuit boards to solder in a row, the fumes can get quite annoying and unhealthy. Thats why I built this very simple but efficient solder fume extractor. 

An old computer fan, a 3D-printed housing and two layers of an active carbon filter stolen from a kitchen fan. Removes pretty much all the smoke and smell and cost me more or less nothing. A very good investment in my health and sanity.