how to ensure enough ventilation in snake tub

i,m using snake rack for all my Ball python, the tub is 65x43x20cm with 1 line of holes around all sides.

how to ensure that my snake tub doesn't have stagnant air in the tub, and the ventilation is good?
btw, my ambient humidity around 70-88, its high since i lives in tropic, temp around 29-33C.

If it's too stagnant you may see condensation build up on the sides of the tubs. If that's the case, just pop a few more holes. Most likely it will be fine though.

Just open it up once or twice a day when you check on them, and theyll be fine