Gas flow within additive manufacturing devices

A device for additive manufacturing of a three-dimensional object from a powdered material, the device comprising:

• a main body providing an object forming chamber and an opening for accessing the object forming chamber, wherein the opening is arranged within a front wall of the main body;
• a work surface delimiting the object forming chamber and having a build platform section for manufacturing thereon the three-dimensional object;
• a door provided at the front wall and being positionable in a closed state to seal the opening and in an opened state to provide access to the object forming chamber;
• and
• a gas flow system for providing a gas flow across the build platform section, wherein the gas flow system comprises a first main body section extending within the main body and a door section being an integrated or attached part of the door, wherein the door section comprises a first opening structure arranged to release gas to or receive gas from the build platform section in the closed state of the door.