Acid-proof extraction arms ERGO-MINI are designed for removal the dust and gas impurities arising at workplaces during processes of not large emission of contamination. They are manufactured in two diameters Ø50 and Ø75. Due to the self-adjustable frictional joints and swivel, User can set the arm in the most convenient work position. The elements of the extraction arm are constructed of acid proof materials (i.e. PVC, polyamide, stainless steel). They can be applied among others in chemical-, pharmaceutical-, electronic industries as well as in jewellery workshops. The extraction arm can work with an appropriate extraction fan that serves a main collecting ductwork, where other several to several dozen extraction arms are connected.