Universal no-smoke: the UNIVERSAL NO-SMOKE self-supporting suction arm represents the best technical solution for the suction of welding smoke, gas, vapours, aerosol, oil fumes, dusts, etc. Operating principle: the polluted air is sucked in through the articulated hood and passes through pipes made of sturdy sheet metal (zinc-plated, inox, stainless steel, scratchproof enammeled, aluminum) to the high-efficiency centrifugal fan or to the system’s central piping system, and from here to the filtering unit used in the specific applications.