Weller soldering iron fume tip extraction systems weller 112 0000 esd the weller ft 12 fume extraction unit operates from a clean and oil free compressed air supply the vacuum is generated by a maintenance free compressed air converter the contaminated air is purified by a pre filter and main filter system a compressed air cleaning filter removes additional odours caused by the compressed air this highly efficient filter system makes the ft 12 a genuine air recovery systemweller fe fume