The big tents like that most guys suspend box fans for air movement. The large fans move a lot of cubic feet of air without strong airflow from a sweep fan that can parch a plant from airflow. That is basically 2 of mine and that boggles my mind. I have a s*it ton of fans in tent and I still find dead spots with little moveable cubes for Humidity and temp.
2 4 inch will not be effective if you run enough lights to use the whole tent. if you have say 700 watts and want to run about 1/2 I think the math holds up for air movement but not with 1509 watts. 8 inch or 2 6 inch units.
Before launch see if you can do the following.
raise temp to 85 and then humidity to 60%
lower temp to 75 and raise humidity to 80%
lower temp to 65 and reduce humidity to at least 40%
These are normal benchmarks for various strains we see grown here
If you can not hit those marks you will have issues with growth and how good the plant can resist stress. Not saying you will fail but it is so much harder and yields can suffer.
Lots of help from folks here. Ask about media and nutrition and testing tools for lights, PH and EC.
Highly recommend you read grow journals and diaries. You can navagate to the diaries area and use the search feature to look for growrs who are using your media and nute choice. Read the old ones and see how the rails came off so you do bot have to learn that one. I read at least 60 diaries before my first launch and still did not learn that a $20 PH tool will break your heart.
