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Apparatus for guiding the wind at the top of the exhaust conduits of the gases or fumes and by ensuring that the pulling normal and in the reinforcing prevents any backflow of those - latter to the inside of said ducts
Apparatus for guiding the wind at the top of the exhaust conduits of the gases or fumes and by ensuring that the pulling normal and in the reinforcing prevents any backflow of those - latter to the inside of said ducts