Live Stoner Chat Air extraction advise

[briman]

Hello all, I could use your help in venting a small tent for a breeding project. I'll give you the size of the tent and see what you all come up with...Any help would be much appreciated!!

The tent ans dimentions-
Lighthouse Hydro
2.5'X1.3'X3' (30"wide X 18"deep X 36"high)
http://www.lighthousehydro.com/grow-tents/full-mylar-grow-tent-2-5x1-5x3.html

looking at a 4 inch carbon filter with a 100 cfm fan. This would be running 24/7 and looks to be the lowest cfm fan I can get. Are there better options out there??
Here is the fan and filter.
http://www.amazon.com/gp/product/B004OGY8XG/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A19I28AKMOKQVB
http://www.amazon.com/gp/product/B00F6BL11U/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A2WRS4X4C0GMOQ
Is this setup too much air movement to for this tent being on 24/7?? Any help would be greatly appreciated!!

 

[namvet25]

The 100 cfm and filter is about a small as you can get.You could et a variable speed controller and turndown the fan speed if needed.

 

[Son of Hobbes]

Hello all, I could use your help in venting a small tent for a breeding project. I'll give you the size of the tent and see what you all come up with...Any help would be much appreciated!!

The tent ans dimentions-
Lighthouse Hydro
2.5'X1.3'X3' (30"wide X 18"deep X 36"high)
http://www.lighthousehydro.com/grow-tents/full-mylar-grow-tent-2-5x1-5x3.html

looking at a 4 inch carbon filter with a 100 cfm fan. This would be running 24/7 and looks to be the lowest cfm fan I can get. Are there better options out there??
Here is the fan and filter.
http://www.amazon.com/gp/product/B004OGY8XG/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A19I28AKMOKQVB
http://www.amazon.com/gp/product/B00F6BL11U/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A2WRS4X4C0GMOQ
Is this setup too much air movement to for this tent being on 24/7?? Any help would be greatly appreciated!!

Is your question geared more towards intake/exhaust or towards sizing your carbon scrubber correctly?

I've been trying to nail down a better formula for sizing scrubbers; I started e-mailing some of the manufacturers and the only person that spent any time e-mailing me back was Phresh Filters. The rep for their company suggested sizing the filter to the grow light (in my information search, I found others basing their scrubber requirements not on the size of the room necessarily, but by the size of the light (which would more than not dictate the size of the room.)

His final suggestion was "bigger is always better with carbon scrubbers." I believe that to be true as well; but the fan still has to be appropriate sized to the size of the scrubber.

Here's some food for thought bro:

In the first link with that scrubber you posted, if you look down at the information listed it shows this:

180 Optimal CFM

The fan you have listed has a CFM rating of 100. You're 80 CFM short of even meeting the minimum suggested required air flow for the scrubber. You're barely going to be scrubbing air with that baby. Also take into account the air reduction from attaching the filter to the fan; which in most place I've seen is generally accepted as nearly a 20% reduction, so that 100 CFM fan is actually running around 80 CFM right out the gate.

Also, would recommend staying away from using an in-line booster as your fan for your scrubber; centrifuge fans are far better suited for the job, work more efficiently and are generally far quieter. I know there's a good $30-40 price difference between the two but I think you'd be far better off. You can get a VenTech 190 CFM 4" centrifuge fan for $60 on Amazon. Would be PERFECT for your filter you have listed.

I wouldn't even put a fan controller on it; any reduction is immediately going to start negatively impacting the effectiveness of the scrubber based on those specifications.

Just my two cents brother!

 

[namvet25]

"My 2 cents"I'm not an air flow engineer but you have around 15 cubic feet in your grow box.I would think a blower that moves 100 cfm or maybe a little less with that small filter would change you air about six times a minute.Unless you want to suck the green off the leaves that blower combo should be just fine.

 

[Son of Hobbes]

"My 2 cents"I'm not an air flow engineer but you have around 15 cubic feet in your grow box.I would think a blower that moves 100 cfm or maybe a little less with that small filter would change you air about six times a minute.Unless you want to suck the green off the leaves that blower combo should be just fine.

That's not really my point bro; he's got a scrubber with a rating of 180 CFM. In my opinion based on reading and practical app, you don't stick a 100 CFM in-line can fan on a 180 CFM rated scrubber. Those CFM ratings are set by the manufacturer to give you a guideline of what you need for optimal air flow to maintain the highest efficiency. Run your fan speed too low or a fan that is under power and you're not drawing air effectively through the scrubber, reducing it's efficiency greatly (also if the fan is working hard, the motor is probably producing more heat.) Run it too fast and you're moving air through it so quickly that there's no time for the process of adsorption, which also greatly reduces the efficiency.

It's just my opinion, but I just don't see the point of using your carbon scrubber as your grow space exhaust if the fan isn't strong enough to make the carbon scrubber do it's job. There's a reason those guidelines exist. :dunno:

As to your leaf sucker comment, well I've run 400 CFM on my 6" scrubber in about 30 cubic feet of space and they stayed pretty leafy wink wink nudge nudge

I hear what you're saying though nam; it seems like a lot of airflow for that space, but that's my reasoning at least.

 

[bad dragon bzzz]

its not the only tent you have ? could feed a tube into main tent drawing air through the smaller tent ? if it wont have stinky mature females in it would a couple of pc fans not do the trick ?

 

[namvet25]

Ok your right,i didn't see that optimum cfm for that filter,in other words he needs a blower to match the optimum listed.:tiphat:

 

[briman]

Thanks SOH and Nammy!! A 4 inch exhaust fan and 4x12 carbon filter is what it will be!!

 

[n00b]

I use a 4x12" Phresh with a Hurricane fan (link) and you can't smell a thing from my cabinet..even venting directly into the room. I also have a PC fan for fresh air intake which improves airflow and temperature tremendously.