My grow box is 2x3x6 How large should i make my passive intake with this fan?? http://www.ebay.com/itm/271146383640?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 also the direction on the fan doesn't really matter right? Im planing on having my fan facing the ceiling blowing the air out the top on the grow box. Thanks!
You should have at least 8" passive intake area. Direction doesn't matter (at least blowing out) as long as you don't restrict your ducting. 90 degree angles are not really good, it reduces the total CFM your fan is pulling.
thanks dawill. My original plan was to have the fan horizontal with a 90 blowing the air out the top.. but if i can have the fan facing up blowing out the top would work best Sweet!
All you can do is try it that way. Worst that could happen is you have temps too high while you're testing it.
I have a 6" fan 700 or so cfm, hooked up to a carbon filter. That's all hanging from the cealing. And my intake hole is 6 "with a particle filter, is a foot from the floor. And I have another carbon filter on the outside of the GR. tons of fresh air pumpin in 24 seven . . Works great , no smell , .
I just sort of guessed on the ventalation, I wish i was a pro . . . I know I have quite a bit of negitive pressure . I think I read that was good? That's why left it that way , I'm hopeing when i introduce co2 the negitive pressure will work in my favor . Thanks for clearing that up . When I read about the ventalation it seemed everyone's answers were different . . Sent from my iPad using Grasscity Forum
Passive intake area total should be sized 2x larger than area of exhaust. Intake cool air low and exhaust hot air up high. Sent from my SM-N900V using Grasscity Forum mobile app
Gk - adding CO2 while ventilating only exhausts co2 in a wasteful manner. Sent from my SM-N900V using Grasscity Forum mobile app