I tried too many things, tried increasing my exhaust fans to a total of 13,000 cfm but no help. The other fans keeps slowing down their rpm. Tried putting the same fans to suck more air from the evaporative cooler but still some of the fans loose their speed because some of the suction is coming from the inside of the room.
The miners are sucking out more air than you supply in ( for the cold side ), when that happens the cold room will need to replace that gap in "air supply", and thus it pulls air from the hot side of the room if you were to completely block the wholes in the MDF sheets the air will be forced through the miner's fans even if they were running at 100% speed, if it can't, the whole room will collapse.
You HAVE to add more air to the intake side, if you can't do that on the walls, simply use the roof, if you can't, then you have to reduce the number of miners, there is really no workaround to by-pass physics.