I do OK as it is.....I'm just looking to up the game a bit is all. Always be improving..
I tried that flap crap. Ya have to remember to close it in lights out.
I solved that crap with some dryer hose in one of the large intakes at the top.
Lots of over hang on both sides.
Inside, I bring the hose to my left front corner and down a bit. It blows on the oscillating 12in fan I have hung upside down. That mixes the intake air well in the tent.
Outside the tent, the hose comes down about half way and I have it taped in place. Under the hose, I have the bigger humidifier sitting on a little night stand. I can adjust the position of the humidifier to maintain a higher level in the tent for like veg.
Heavy into late flower now, it's positioned further away. It's mainly for lung room Rh currently.
The 2x4 has a simular setup. It has a smaller humidifier
Currently, I have both tents running at different VPDs. 4x4 is running at 1.5-1.6 and 2x4 is at 1.1-1.2