GrowCNanswered grow question 3 years ago Is your tent 24 inches x 24 inches or is it 2.4 meters by 2.4 meters?
The best way is to use a vent fan with temperature and humidity control. That way the fan automatically does what is required to hold the temperature and humidity you want.
I think the biggest openings in Mars tents at the top are 8" (20cm). You might be able to use one fan but it will have to run faster and noisier. If you want it to be quieter you might need two fans.