It’s more about pressure than airflow. You just need negative pressure inside the chamber, so gas escapes into your chamber through the cracks, and out the vent.

I have my prusa connected to my WiFi, but it only serves up a Web page with limited control locally. You can only upload gcode, and start a print if the printer is ready to start. And it’s open source so I’d expect the community to have found any issues.

You should monitor it’s connections at the firewall and see if it’s trying to make ANY connections outside your network, no reason for it to try making any dns queries even.