6" or 8" vortex?

[Guest]

Im sure this equation is on here somewhere, but I couldnt find it-
My room has 124cf of space. I was planning on buying a 6" vortex fan. Will this be big enough? How many times/minute should my air be exchanged?
Any help on this would help alot b/c im ordering it tonight!

 

[BudGood2006]

You need to find out the cfm rating of the fan (cubic feet per minute), and divide that into the space you have (124/cfm of fan=amount of air changes). If it were me, I'd buy the bigger 8" fan. You can always add a speed controller (a dimmer) to slow it down if it's too much. Or get a higher rated 6". Hope that helps.

 

[Sauce]

I agree bigger is always better. Get a speed controller if you don't need all the cfms.

For the little extra $ it's better to be safe in case you add more wattage later on. Also larger fans are always more efficient (power and cfm wise) and run quieter at the same cfm.

 

[NiteTiger]

Go big, that way you can scale up later without outpacing your equipment.

To answer your question, a 6" Vortex is rated at 449 CFM, and an 8" is rated at 747 cfm (that's the one I have, BTW), so roughly, the 6" is going to exchange the air in your space every 15 seconds and the 8" every 10 seconds.

Both, obviously, are way overkill for your space

But I couldn't agree with BudGood and Sauce more, go big and you won't regret it. But the speed controller will be a must in your situation, because you stick an 8" Vortex in that space full bast, and you'll no longer have a grow room, you'll have a wind tunnel with a coupla plants in it

 

[GOT_BUD?]

I was recently faced with this same dilemna. I reasoned that another 200 cfm was well worth the extra $50.

This just happened to work out nicely with my master plan of two 5' x 5' x 7' flowering rooms with a 1 k in each, with air being pulled from each cabinet and then out of the house through the attic

 

[Guest]

I went 4" fan and later ended up having to do 4->6 converters in my system as well. Now I *really* wish I went 6".

 

[Big Bud Bear]

I went 4" fan and later ended up having to do 4->6 converters in my system as well. Now I *really* wish I went 6".

same here.

 

[Guest]

Thanks for all the advice guys!!