what cfm fan

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shotgun1

Member
what cfm fan to use with a air cooled 1000w hps. do i push the air through or pull the air out? 12x14 room no tent
 
xxterminator

xxterminator

Member
def pull air out and as AU420 says 8 inch will do the job,ive done it on a 6 inch fan pulling through 2 cool tubes(1 400w, 1 600w) in a tent 1m2,but it was hassle setting it all up!play safe go with 8/10 if your in a room.

happy growing.
 
torontoone

torontoone

Well-Known Member
A good 6" is fine. I cool 2 1k lights in my veg room, and they are cool to the touch.
BEST DEAL - http://www.businesslights.com/valueline-inch-435-cfm-centrifugal-inline-fan-p-2045.html
Just try to keep your turns to a minimum, are use metal ducting for long runs.

However - If there is even the slightest chance of expansion later, go ahead and spring for an 8" now !

PS It is ALWAYS better to push air though a system that is going to be ventilated
to the outside. If you have ANY air leaks in your system, you'll be sucking "That Smell"
out for the world to smell...
 
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shotgun1

Member
i have 1 vote for push and 1 for pull. could i have a few more responces. could someone tell me what cfm to buy? also my fixture is a 6 inch aircooled 1000 watt hps. should i buy a 8 inch fan and adapt it to the 6 inch hole or just buy a 6 inch fan?
 
torontoone

torontoone

Well-Known Member
Dude, Trust what I say. I'm a Mechanical Engineer and long time grower.
My grow room looks like a Lab at the CDC... ;)
 
S

shotgun1

Member
torontoone said:
A good 6" is fine. I cool 2 1k lights in my veg room, and they are cool to the touch.
BEST DEAL - http://www.businesslights.com/valueline-inch-435-cfm-centrifugal-inline-fan-p-2045.html
Just try to keep your turns to a minimum, are use metal ducting for long runs.

However - If there is even the slightest chance of expansion later, go ahead and spring for an 8" now !

PS It is ALWAYS better to push air though a system that is going to be ventilated
to the outside. If you have ANY air leaks in your system, you'll be sucking "That Smell"
out for the world to smell...
Click to expand...
what do you mean by turns?
 
R

R1Farmer

Active Member
In regards to turns...meaning any degree of bends or turns in your ducting will reduce the efficiency of air flow considerably. If your ducting requires a 90 degree turn instead of creating a right angle (and L or elbow bend) try to create a gradual 'turn' if space allows. Basically, the more bends and turns you have the more fans you will need to move air effectively (or invest in a high quality fan that will push/pull more cfms).
 
BudJunky

BudJunky

Well-Known Member
I asked this question before and the response I got was around 265cfm. I would go with a 300-400 tho just to be safe..

I am going to try to use the Stanley blower mod to cool mine. I'm still in the process of setting everything up tho. I'll let you know if it works when I'm finished.
 
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