I have tried many unsuccesfull mechanical ideas to properly aerate the grow chamber 24/7.
After many intricate failed approaches, I have come up with an easy, cheap and very accurate solution:
Took a very-very small computer 12V ventilator and stuck it hanging in the air outside the two Co2 lower holes of my box.
The exact and accurate aeration position was found easily by moving slightly the tilted ventilator stuck to the box body via common tape, any tape.
Consulting the Hygrometer reedings at the opposite side of the box it took me less than an hour to calibrate the tilted air fan at the disired humidity...
Voila the poor man's marvel.
