Carbon Filter Cabinet - Venting Help

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slowlyoozing

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I have a 1.2x1.2m (4x4ft) and 1x1m (~3x3) tents in a sealed room.
Both were filtered and vented into the room with 580m3h(340cfm) and 360m3h (210cfm) inline fans respectively.
I need the filters and fans out of the tens because I need the room so what I did was get a wooden enclosure made for the bigger fan and carbon filter and hung it near the ceiling.
The 4x4 tent is connected to the enclosure with an open, unobstruced 6" duct about 3ft long strait from the reflector in the tent. The other side of the reflector is open.
The 340cfm fan now sucks the air from the box, through the carbon filter and blows it into the room through a 6" duct about 3ft long going through a hole in the side of the cabinet (I sealed the space between the duct and cabinet of course). The air from the tent is sucked to the box then throught the filter and fan and out to the room.
The cabinet door was not a snug fit but thats to be expected so I bought a strip of soft foam insulation and it fit perfect around the edges of the cabinet making a good seal (I hope).
The plan is to connect the smaller tent to the cabinet and have the fan empty both tents. That's not an option until I solve my problem.
My problem is: it manages to keep the smell out and the temperature at bay but it does not keep up with the humidity. It goes over 70 in just a few minutes.
I initially estimated negative pressure would go down some but I would still have enough air moving thought the tent. Was I completly off in my wishings or is it a matter of better sealing the cabinet. Do I need to upgrade to the next fan size available here, 8" 800m3h(470cfm)? Would that be enough for both tents? How frequently would the air be completly vented in each of the tents?
Can someone help me with modifing the venting formulas to my unique situation?
Thanks
 
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slowlyoozing

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I do have a dehumidifier.
The RH in the room is 40-50% but the air is not circulated fast enough through the tent and RH inside the tent is close to 70%.
 
DrMcSkunkins

DrMcSkunkins

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You just need another fan and filter I guess, you are sucking hot air into your tent from a grow box is what it sounds like. You need to be pulling fresh air from the low humidity room, not hot humid air from another grow area.
 
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slowlyoozing

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You got it backwards.
I am sucking cold dry air from the room into the tent.
Instead of the carbon filter taking room inside the tent I built a wooden box, hung it up near the ceiling and connected in to the tent with 6" duct so air can move freely from the tent into the box.
I placed the carbon filter inside the wooden box and vented it outside of the box into the room.
The air is sucked from the box which get sucked from the tent.
I hope I'm clear now.
 
DrMcSkunkins

DrMcSkunkins

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you need a fan and filter for each tent/room...
 
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slowlyoozing

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I have explained that this was my previous setup and I am changing it out of necessity.
I need someone to point out what I'm doing wrong and help out with the calculations.
I know it can be done right, I seen pictures on the internet..
I appreciate the help but telling me to do the opposite is not helpful.
Cheers
 
DrMcSkunkins

DrMcSkunkins

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You can see a guy turn lead into gold on the internet, that doesnt mean you can really do it. I dont see any way possible to suck hot moist air from one tent into another and keep the second tent cool. If you figure out a way I would like to see it.
 
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slowlyoozing

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Dude are you even reading my posts?
I'm not pumping air from one tent into another but into a wooden box, then from the box through the filter and out into the room.
See the attached image it should be clear what's going on.
I need an airflow guru to chime in here
 
Enclosure Copy
Bearfamfarm

Bearfamfarm

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Just from that pic you need a passive intake on the tent. Air will find the easiest path to travel and you are probably not getting anywhere near the airflow into that tent add a piece of vent hose to one on the holes on your tent. Bend it to create a light trap and then check your humidity again in an hour. Good luck mate.
 
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slowlyoozing

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My bad I forgot to include it but of course I have air coming in. I tried passive intake and vented (4") intake with no difference in the outcome.
Here's the updated image
 
Enclosure Copy 2
DrMcSkunkins

DrMcSkunkins

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slowlyoozing said:
My bad I forgot to include it but of course I have air coming in. I tried passive intake and vented (4") intake with no difference in the outcome.
Here's the updated image
Click to expand...
Have you tried it with the van and filter flipped around with the fan pulling air directly from the tent and pushing it out the filter?
It sounds like you might have some leaks in your box. If you attach a duct directly to your tent and push the air through the filter at least you know that theres no leaks between your fan and tent...
 
DrMcSkunkins

DrMcSkunkins

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If youre trying to pull air through more than one filter by hooking more than one duct to your box and using one fan then your cfm of your fan is being split between the filters.
 
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slowlyoozing

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Okay so I thought of doing it like you suggested, one fan sucking both tents using a T connector and blowing through the filter. To my understanding it is much less efficient and stresses your fan. I guess it is a viable option but I already invested myself in the enclosure configuration and want to try and get it to work before I rip it out.
The enclosure, in my untrained opinion, should not impact air circulation that much. It just adds a bit more volume to the air that needs to be sucked out (less then 10% including ducts) but of course it has to get sucked from further away, though 6" duct which may be the Achilles heel of the whole thing. the 6" duct could be restricting air flow too much.
I have checked the box for leaks multiple times and reckon it's not a leak issue.
 
visajoe1

visajoe1

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did you get it figured out?

from what i can see, obviously its an air flow problem. you need more of the room air with 45% RH going into the tent. can you increase the size of the intake? are there extra openings that you can open?

regarding your fan setup, that explanation is confusing to read, but what stands out to me is the cfm ratings for your tent sizes. they are too small! that 4x4 needs 450cfm+ and the 3x3 will barely get by with the 210cfm assuming short duct runs. i use a 240cfm in a 2x3. like another poster said above, you lose cfm when pulling through filters.

upgrade your fans, allow for more airflow into the tent, problem solved.
 
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