My tent has four fans in it (Jesus, i never realized that till now, LoL). Two fans stay on all the time: my tent exhaust fan, and a small oscillating fan blowing air on the plants down at floor level.
My two fans that are used for cooling lights shut off when the lights go off.
I’ve got four also, one oscillating floor fan per tent, and one 6” exhaust running on low, everything runs 24/7. I’ve fashoined a junction where by I’m exhausting three tents, two 4x4’s one one 2x3 via the exhaust fan and ducting...cob lighting.
I have 4 fans as well!! Intake , exhaust and. 2 recirculating
It’s on a controller that automatically turns on exhaust temp depending and when humidity is high. The intake in based on temp/co2 levels, since I inject co2. The fan comes on time based, say co2 is feeding, up to 1500ppm, the fan stops until that drops to 980ppm, then time based exchange happens for 15min/hour. Weird setup but works for my setup.
Fan speed on exhaust is max, intake at lowest setting (using variable speed controllers )
The recirculating has fans are on 24/7.
I use a sentinel all in one controller