Been looking into getting one of these cloudline smart fans. I know a lot of heads on here use them. I am going to be running a spider farmer sf 2000 (600watt hid equivalent) in a Gorilla 2 x 4 grow tent. What size cloudline fan would you guys recommend. I was looking at the 6, but wondered if the 4 would work ?
The four should work, but I’m running an S6 on my 2x4 tent (with a reducer) with the speed turned down a bit, and it’s pretty quiet while moving as much air as a four inch on full speed, with room on the dial for more 
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I run an S6 in a 2.5x5 any it still gets warmer than my liking, with a filter and muffler on it. I bought a S8 but haven’t switched them out yet.
For context it gets about 87 at lights off. Using a hybrid CoB / quatum board combo array
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I am running the cloudline s4 in my 2x4 tent with a bridgelux eb2 LED home made light like in that post.
Not sure if it’s comparable to yours as far as wattage or coverage I don’t know much about it to be honest but with that light the fan does great keeping up and I’m only running it about halfway.
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T4/S4 for a 2x4 if running leds like you said, I have a T6 for my 6sqft and its over kill i never go past setting 2 out of 10 and even then it modulates on and off as needed
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