UFO-S filtering units are applied for cleaning the air from dust- and gas impurities, arising during various production processes. They are irreplaceable for capturing the dry dust particles, arising during welding and other processes, where fine dust is being emitted. Maximum temperature of the conveyed air should not exceed +60°C. Due to automatically regenerated cartridge filters, the dust particles are separated on the outer filter surface. By means of impulses of compressed air, the contamination is cyclically struck off from the filter surface.