How big of fan should I get?

Aero Garden FTW

Member

• Mar 21, 2014

• #1

I've got a 2x2x2 veg box that is air and light tight. I'm running 225-450w CFL's w/ lots of ducting. I wanna use a 4" vortex but don't know what the proper cfm would be. I DON'T want it to overheat.

 

Aero Garden FTW

Member

• Mar 21, 2014

• #2

I'm thinking this might work?
http://www.ebay.com/itm/4-6-8-10-CO...wer-Inch-/290927453266?_trksid=p2054897.l4275

 

GrowinDad

Well-Known Member

• Mar 21, 2014

• #3

Any 4" ought to work. but not if it is truly air tight. You need passive intake, some place for air to get in.

 

joe blow greenthumb

Well-Known Member

• Mar 21, 2014

• #4

Intake should be in the bottom 10% of the grow area while exhaust should be top 10%. The exhaust can be expelled from anywhere but it should draw from the top. Say if you have ducting hanging in the top but can put a hole there. Just hang open end in the top and run the ducting down to where you have a hole. Place the fan where the exhaust hole is.

 

joe blow greenthumb

Well-Known Member

• Mar 21, 2014

• #5

I'm just using an inline can(6")fan to exhaust my 4x4x6.5ft tent. I leave mine on 24/7 and the circulation fan in the tent comes on with light timer.

 

skunkd0c

Well-Known Member

• Mar 28, 2014

• #6

i would go for a 5 or 6 inch it might be a little more than you need better safe than sorry
i had a 125w in a bigger cupboard than you have for a mother plant

when closed it was getting over 85f
it takes time for the heat to build up but it will get hot without good circulation in a closed box even with just 125w

peace