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Could you add a fan at the exhaust end to create an ever present, gentle, negative pressure to encourage the air to flow that way?
Acinfiniti makes duct fans that have a temperature sensor and when it detects the change in temperature it turns the fan on. I took one apart and used the sensor, pcb and fan in a different project without problems.
I have a box with 10 old laptops that I keep around, just for that. Unreal tournament 2004, Insane, Brood Wars and all the Id classics. I don’t get to set it up a lot, but when I do it’s always a hit.