One thing for sure I will never make another closed rig.
Wise decision, seems you don't know a shit about cooling.
Your comment is not necessary and its only a shit post, because it helps no one. If you read whole posts (from which you quoted only small part), you will understand that for OP its simpler and costs less if he builds open rig. And I support his thinking, because closed rig is not always best option. Also, we are here because we want to learn and need help in solving problems, not all people are all-knowing like you are. So next time just stay silent...
Oh yes all that advices/shitposts, seems you don't even know how GPU cooling solution works. It doesn't matter how many FANs he is gonna mount this won't work.
I'm running a closed RIG with 6 GPU, you know just with 3 FANS and max. Temp. is 47°C with ethash and 41°C with cryptonight, no AC or anything else.