Gas flow systems for an additive manufacturing machine

An additive manufacturing machine, comprising:

• a build platform;
• a build unit;
• a gantry positioned above the build platform and movably supporting the build unit within a build area;
• a condensate evacuation subsystem comprising a condensate loop and a first gas circulation device operably coupled to the condensate loop for circulating a first gas through the build area proximate the build platform from a first discharge port to a first suction port;
• and
• a purge air subsystem comprising a purge air loop and a second gas circulation device operably coupled to the purge air loop for circulating a second gas over at least one sensitive component of the additive manufacturing machine from a second discharge port to a second suction port, wherein the first gas and the second gas have at least one of a different flow rate or a different pressure.