hi i have a 1mx1mx2m grow tent and currently have an exhaust fan that does 170cfm or 290M3/H and it goes to outside and a fan that blows air in from outside to tent at about 100cfm or 170m3/h . thats what they say they are rated but with my 600w hps light, my grow tent can reach 30c or 86f with in 10 mins of coming on. have i got the wrong size exhaust/inline fans? what size would i need in a 1mx1mx2m grow tent to keep it at around 26c or 78fm,79f?
here: best thread on venting in the world Ventilation 101 - Growroom Designs & Equipment - International Cannagraphic Magazine Forums
What's the temperature outside your tent? Your tent can only get that cool. The easiest way IMO would be to take the intake fan and use it as a second exhaust. That way you're getting 460cfm. Have a passive intake.
I had to upgrade my exhaust fan due to humidity issues . My old one was about 118 cfm in a smaller tent than yours and it wasn't strong enough . I agree with @DaPhats . Just have a passive intake.