4" anything is way too small for a tent that can handle 4x 600 leds ie a large tent.
a 4" filter is for drying tents or single plant mini grows etc,doesnt have the throughput to handle much more,certainly not a full grow and youll be fkd when it all starts to stink.
a 4" fan is ok generally for assisting air
in,no filter,you want negative effect on the tent,more extract than air in does this,is your tent sucking its sides in? etc.
6" extract inc filter is pretty much the minimum for a large tent ,500m'3 fan joined to a 600m'3 filter for example.
8" is even better
after getting all that sussed,temps/rh are a case of dialing in the fans with speed controller on the extract mainly,but sometimes the inlet as well.
masses of info on thct and a hundred different ways of doing anything,make the most of other peeps fortunes/misfortunes to figure out whats best for you .
cheers n atb.
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