The UFO-4-M/N filtering unit is applied for cleaning the dust laden air from impurities arising during the manufacturing processes. It is irreplaceable in capturing the dry dust, formed during welding, grinding the non- sparking materials, gas- or plasma metal cutting and other dust-emitting processes, in chemical-, pharmaceutical-, plastic industry, and others. Maximum temperature of the forwarded air is +60°C. The appliances are equipped with cartridge filters, capturing dust on the outer filter surface. The accumulated dust (on the filters) is struck off by cyclical compressed air impulses.