Opinions on Carbon scrubber

[DarthHerbage]

Well, I only have a Clonebox which is 4 x 2 x 4 = 32 sq ft.

I have an intake at about 40cfm, some passive intakes, and an exhaust fan @ 60-90 cfm (w/fan controller).

The exhaust hole is 4 inches in diameter and the fan is 120mm.

I tried a DIY carbon scrubber and it isn't working.

I'm about to switch to 12/12 and it's already getting funky so I'm wanting to just go ahead and find a good odor solution.

I'm thinking of one of these two things:

the 11 inch one here: http://www.wormsway.com/detail.asp?sku=CF0067

"
When used in conjunction with the appropriate inline fan, Can Filter 705 successfully eliminates odors via activated carbon for up to 18 months. Can Filter 705 has a screw-on/snap-on mounting feature; the flange is sold separately. Outside diameter is 4.32"; max cfm is 13/22 m<SUP>3</SUP>h @ 0.1 second contact time."

Cost: 37 bucks plus shipping.



OR


this one here: http://www.htgsupply.com/viewproduct...roductID=49749

"Elf Activated Carbon Filters are constructed with a "packed bed" design to give consistent performance, long life (12 to 18 months), and are completely maintenance free. The packed bed design prevents the formation of preferential channels which can allow untreated air through the system. This unique design gives Can-Filters a larger surface area for significantly lowered pressure drops.

Specs:

Recommended Max Airflow: 150-265cfm
Flange: 4 inches (built-in)"


Cost: 60 bucks.


Any thoughts/advice/suggestions are appreciated.

[AugustWest]

Originally Posted by DarthHerbage

this one here: http://www.htgsupply.com/viewproduct...roductID=49749

"Elf Activated Carbon Filters are constructed with a "packed bed" design to give consistent performance, long life (12 to 18 months), and are completely maintenance free. The packed bed design prevents the formation of preferential channels which can allow untreated air through the system. This unique design gives Can-Filters a larger surface area for significantly lowered pressure drops.

Specs:

Recommended Max Airflow: 150-265cfm
Flange: 4 inches (built-in)"


Cost: 60 bucks.


Any thoughts/advice/suggestions are appreciated.

i've been using the 6" version of that same one http://www.htgsupply.com/viewproduct...roductID=52570
it's worked great for me.. i've got 5 decent sized plants in late flower and no smell in or out of the house at all.

I did buy this one because i plan on growing a notoriously stinky strain and i wanna be safe. http://www.nehydro.com/store/index.p...roducts_id=172

[DarthHerbage]

Thanks for the info, mane. Good to hear from someone with one (albeit the bigger version). I'll also assume your room is a hell of a lot bigger than 32 sq ft.

The only thing I'm wondering about is that it states:

"Recommended Max Airflow: 150-265cfm"

...and the highest I'll run is 90cfm. I'm assuming that won't be a problem though as it's talking about the "max" airflow.

Nice. I'll be ordering one within the week.

I'm already tired of having to tell everyone I just got done smoking every time I have someone in that room lol.

"Yeah, I'm soooooo baked homes"

[AugustWest]

i'm so newbie at this whole airflow thing man.. i know that too much airflow is ineffective (according to the dude at my hydro shop). I'm running my vortex fan at like 75% to compensate. Whenever i crank it up to 100% it starts to stink so i know the dude is right. As far as your issue.. i have no idea at all man, but those HTG dudes are way cool tell them the model of your fan an they'll hook you up with what ya need.

peace

peace

[DarthHerbage]

Yeah, I think the reason for that is if you have too much airflow for the filter than the filter is unable to work on all of the air going through. Therefore some stinky air gets through.

However, as far as my issue goes I'm thinking that as long as I still have enough airflow (which I believe will be fine because 90cfm is overkill for 32 sq ft) then hell, it just might make the filter last even longer.

I'm thinking it's the right way to go because after googling the first one i linked to I found this out:

"The heavy-duty CF Can Filter 705 successfully eliminates odors for up to 18 months. Moving 39 cubic feet per minute, this carbon filter weighs just under 2 pounds. "

I think I'd rather have my fan running at 90cfm than 40cfm to keep those temps down.

Thanks again for the help, August. I'd rep ya up some but I have to spread it around before I can hit you up again.

hold a second there buddy. First off, your room is 32 feet cubed...not that thats the big issue here, but making sure you undestand the idea.

However, as far as my issue goes I'm thinking that as long as I still have enough airflow (which I believe will be fine because 90cfm is overkill for 32 sq ft) then hell, it just might make the filter last even longer.

When dealing with above average temperatures you will want your fan to exchange the grow room air 3-5 times in one minute. And shit man, I lost my point of reference for your question. By having a CARBON SCRUBBER, and a fan like your POS, you fan will only do a certain amount of work under the back pressure, you need to look this up for your particular fan. Point is, you want i think 2x the rating just for havign a scrubber, and you need to adjust the rating for having the airduct, and for having 90 degree turns in the air duck.

I dont have the exact formula, but it was a amazing post by some dude, ill try to find it.

Point is, no, you dont have enough airflow :S sorry

[DarthHerbage]

Thanks for the reply, sticky.

From HTGS:

"Effective treatment requires the exchange of air in the growing area in a period of 5 minutes. Compute your requirements by multiplying the width times the length times the height of your growing area to obtain the total cubic feet. Divide this number by 5 to determine the proper filter size needed.
For example, if your growing area is 8 feet long by 8 feet wide by 8 feet tall, it contains a total of 512 cubic feet. To treat this area in five minutes, you would need to use a fan with a CFM (cubic feet per minute) rating of approximately 102. "

So, for a 512 cubic geet room, a fan of 102CFM would suffice.

Now, I'm not a big math guy, but the fact that my room is 32 cubic feet, approximately 16 times smaller or so to me means that a fan running at even 30cfm with a carbon scrubber would suffice.

What's the math here...Divide 32 by 5 and I'd need an exhaust with a CFM of like 7?

Double it for the scubber and get a good CFM of 15?

What am I doing wrong here or would a 90CFM with a scrubber not be overkill for my 32 cubic foot room?

I agree, the more airflow the better, but I'm hoping to get those temps down by switching to AC in the near future.

So is my math right or am I just having a flashback or something?

[DarthHerbage]

Bump.

I was just wondering if anyone could tell me if I'm on track in my last post.

Thanks.

[Dewave]

http://www.htgsupply.com/viewproduct...roductID=52531

[mordgrow]

Originally Posted by DarthHerbage

So is my math right or am I just having a flashback or something?

math only works when you have the WHOLE equation

and in the real world, its never just A+B = C

sure on paper maybe a 17CFM fan seems like enough, but you toss that first section of alum flex pipe in there and i guarentee you'll lose 10-15 CFM, toss a few bends in there, say bye bye to another 10 CFM, run it any distance, or pull through a filter, your prolly losing another 20 CFM..


anyway

get a 6" vortex inline fan and a dimmer switch from home depot /lowes and call it good!

[DarthHerbage]

I have no more money for this grow, so I will let you all know how the carbon scrubber works with my 90cfm fan. There will be no bends, and there is no distance to travel. But it's all up in the air until I have the thing in my hands and work out how it's going to connect to the exhaust hole, fan, etc.

I will report back though.

Thanks for the replies.

[Sparky73]

My grow box is only 34"x28"x18" - would one of these GrowBright high velocity 4" Inline Fans be too much? How noisy are they compared to a computer fan? I want to make SURE I get the smell out.

So should I go with one of these or would I just be okay with one of the carbon scrubbers that hooks to a 3-4" computer fan?

[AugustWest]

Originally Posted by Sparky73

My grow box is only 34"x28"x18" - would one of these GrowBright high velocity 4" Inline Fans be too much? How noisy are they compared to a computer fan? I want to make SURE I get the smell out.

So should I go with one of these or would I just be okay with one of the carbon scrubbers that hooks to a 3-4" computer fan?

i think you'll be fine with the scrubber that hooks to the computer fan for a box your size.

a 4" inline fan depending on the cfm and size of the filter maybe too much.
If your fan pulls tha air through the filter too fast (has a higher CFM rating than the filter requires) it will fail and you wont get any odor control at all.
You definately need to match the CFM rating of the scrubber to the CFM of the fan.

gl man

[FullMetalJacket]

S&P TD Series Inline Fan. Integrated Mounting Bracket Included. Usually ships within 1-2 Days. For 4 inch round duct - 101/97 cfm (high/low). 1 to 4: $68.00
5+ Units: $65.00

and

a can filter 2900 is what i use. The combo is silent except for a little wind noise on full blast. Definitely quieter than a computer. If you turn the speed down...silent.

so like 120 bucks for everything and you definitely wouldn't have to worry about smell. May want to get a spedd controller too...

Im not a fan for cpu gans for carbon,,,i guess they could work i just dont think they would be strong enough. I see the mass produced cabs use muffin fans...

[Sparky73]

Well this is the one I'm looking at purchasing now. The filter is MADE for the fan, so that shouldn't be a problem. Is this still going to be too large for my box?