Abstract: A manufacturing device for additive manufacture of a three-dimensional component from a powder includes a manufacturing space delimited by a working surface including a powder bed region and a top wall including a protective glass window disposed above the powder bed region. A laser beam can be emitted through the protective glass window and through a beam passage zone to irradiate powder in the powder bed region. A shielding gas system has two outflow ducts, each disposed on the top wall and extending along a duct axis K on each side of the beam passage zone. Each output duct has a duct wall and duct wall sections that allow passage of gas and extend along the duct over an outflow length corresponding at least to an extent of the powder bed region.