Venting Problems

I have a closet box set up and I'm having problems getting the heat out. Currently running an intake vornado circular fan from my air conditioned room and have an inline duct fan hooked up to a carbon filter as the exhaust. It's a 4" in-line suncourt inductor fan that has 80 cfm from home depot, but it hasn't been giving much suction. I can't close the door to my box yet because even with the intake and exhaust heat will rise up to the high 80's low 90's. I'm considering buying the 6 in version of this in line duct fan which is supposed to do about 160 cfm, but that would mean having to redo the ducting and stretch all the holes from 4" to 6" and this would be timely and expensive. Another option I'm considering is setting up a plexi glass enclosing to surround the lights, and that way the 4" fan would have less area to cover and the heat would be trapped in the plexi glass while still giving off proper light to the plants. Any advice would be greatly appreciated!!

that fan is axial, you need a centrifugal fan for pulling or pushing air through a carbon filter. get a can or vortex.

Buy a 6 inch inline fan and 2 coupling adapters for 4 inches to 6 inches. Take your 4 inch ducting intake attach a 4 inch to 6 inch couplingto it and then add the 6 inch fan and then add another coupling but reverse it making it 6 inch to 4 inch back to your 4 inch ducting.

Yep Can filter to a 6" fan through your light and expelled w/ a return vent is a smell free option but dose require some $$$

Sorry i'm pretty amateur at this because it's my first grow, but I'm not sure what a centrifugal fan is or a can or vortex? And in response to dmidura, are you saying that I'm going to have an adapter that has both the 6" and 4" fan working as an exhaust. I have a circular vornado fan blowing in as a intake to the bottom of the box now and I just have a 4" hole on the light board that's connected to ducting then the 4" inline fan and thats connected to the carbon filter and the exhaust out the box. Not really sure what you're saying.

you dont need an active intake, mess around on google to figure out what a centrifugal fan is.

nordowell said:

you dont need an active intake, mess around on google to figure out what a centrifugal fan is.

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any recommendations on a specific one to buy?

Use a passive intake. Suck the hot air out. Don't push air in unless you have a big grow. If you suck the air out you won't have a heat problem. i used to do closet grows and know from experience about inline duct fans. The grow faq has the information on passive intake for your grow.

Inline fan is what you want.

Can and vortex are companies that are good.

think2toke said:

Inline fan is what you want.

Can and vortex are companies that are good.

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I'm using an inline fan now. 4" inline duct fan with 80 cfm but it ain't doin anything. I may add a bathroom exhaust fan and set up another duct.

don't get a bathroom exhaust!!! just spend 100 dollars or someting and get this:
http://cgi.ebay.com/CAP-Valueline-6-Inch-Inline-Exhaust-Fan-Duct-Blower-HPS_W0QQitemZ230392667361QQcmdZViewItem?rvr_id=&itemid=230392667361
it will vent your area nicely.

Replace the 4 inch inline fan with a 6 inch inline fan. You will go from 80 cfm to 250 cfm. In order to use your existing four inch ducting lines use a 4 inch to 6 inch adapter then add your new 6 inch inline fan. You dont need to replace your 4 inch ducting with 6 inch ducting.

I suspect that your 4" filter looking for more like 200 cfm minimum to work properly. Have you tried to turn the intake fan around and make it an exhaust fan as well? In the short run I suspect that this will help but, in the end when the stink starts I think that you will have upgrade the other fan.

Anyone have any relative cheap fans out there that I could get a link too? I can't find any 6" fans with around 200 cfms for a decent price.

I think that the fan that you are using is a booster fan, just looking at the pix. The 8" booster at Home Depot is rated at 210 cfm free air, at $34 I don't think that you are going to be able to do a lot better. Your system is not ideal but, I work on the cheap as well. Did you try and turn that lower fan around?

ow.douglas said:

I think that the fan that you are using is a booster fan, just looking at the pix. The 8" booster at Home Depot is rated at 210 cfm free air, at $34 I don't think that you are going to be able to do a lot better. Your system is not ideal but, I work on the cheap as well. Did you try and turn that lower fan around?

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does home depot sell the adapters to fit my 4 in ducting in the 8 in fan? i can't seem to find the adapters online. so passive intake with a that 8"in booster pulling about 210cfm should be good?

stickybuds808 said:

Anyone have any relative cheap fans out there that I could get a link too? I can't find any 6" fans with around 200 cfms for a decent price.

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Businesslights.com

I have five (maybe six, not sure) of the Valueline centrifugal fans (both 6" and 4") and they work great.