With the PLA you don’t want the chamber temp to get too high on longer prints. What can happen is that the filament warms up too much, softens and causes a clog between the extruder and the nozzle. Most people will just print PLA with the door open. This normally is enough circulation. You can also lift the front edge of the glass top and place printed shims under it to vent the hot air. There are lots of printable options if you go this route. Personally I just open the door.
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