240 cfm fan for 2x3x4 grow box?

C

connerray

Member
I have two computer fans and could probably get more for free, but the two I have now are 1x150 cfm and 1x90 cfm. I'm sure these ratings are max so it would more likely be around 180-200 cfm. ^those are the only "hard fact #'s" I could find on them.
So would this be enuff for a 2x3x4 ft box?
I would put this in the grow design section but seems to be to nubish of a question.
Also should I do both inline for exhaust or the 150 for exhaust and the little 90 for intake? Or two separate exhaust?
Thanks
Coco pebbles
 
I have 400 CFM going out and 160 CFM going in, work nicely.
I live the fresh air inlet on 24/7 and the other fan is controlled with the lights.
 
You need both on first of all. If not there's no odor control. You'll need a true inline fan with a carbon filter. More air needs to be sucked out then going in. This will creat a negative pressure which you need to help control odor control. If that's a need. ?? Also what are you using for lighting.? This will decide if you need more fans or not.
 
Well, this will be some what of a stealth grow and if I leave the intake on and the exhaust off, it will most likely pressuriz the box forcing air out of any small leaks I may have and result in smell. I would rather keep a small amount of negative pressure with the exhaust fan to ensure oder controll
 
Jloi beat me to it.
It will be a fluro/cfl grow so heat won't be a huge issue. I keep my house around 70° f.
It will be in my closet and the exhaust will be let out into the attic for extra oder control
 
Probably 8 CFLs for veg and bump to 12 during flower. Walmart brand 26 actual watts each.
~200 wants during veg and ~300 during flower
 
i run a duct fan a good one thats 260 cfm on a 6" carbon filter in a 3x4x5 with a 400w cool tube and 2 135w leds my temps stay around 80-85f
 
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