I have decided I need some method of fume extraction when soldering at home, this is partly due to having fume extractors at university and in my summer job. I know I can buy one, but being a tinkerer, I would ideally like to make one. This brings up a question about the filtration substrate, is it purely mechanical? I have a fair bit of the white synthetic cotton pad stuff that is used to filter water of particulates. Would this be up to the job, or do I need something that would adsorb the rosin fumes? I have some carbon pellets, but I think if I need the carbon at all then I should get a carbon sponge or something so all air drawn through is in contact with said carbon.