2 level stealth flowering cab - Need help!!!

[windsoft]

As much as I hate drawn pics, I have yet to buy the cab and get working.

I have a canfilter 9000 - two 400w hps's - no EXHAUST YET

My main questions are regarding airflow and what fan to buy. I think I can only run at approximately 100 cfm with the carbon filter I have purchased already.

I am planning on pumping in air with a PC fan and then exhaust out with something 265 or under obviously. Any comments?

 

[Harvest]

how big is the cab?

 

[Harvest]

http://www.icmag.com/ic/showthread.php?t=112862

 

[big ballin 88]

I'm sorry there no way 100cfm is gonna help 2 400w's even remote ballasted. You will need a seperate exhaust for the cab if your running the 400w in a air cooled enclosed hood. Take a look at Ventialation 101 it will tell you what you need to know about cooling a 400w.

 

[windsoft]

how big is the cab?

Haven't bought it - was hoping to get around 2.5 X 3 X 8ft

I'm sorry there no way 100cfm is gonna help 2 400w's even remote ballasted. You will need a seperate exhaust for the cab if your running the 400w in a air cooled enclosed hood. Take a look at Ventialation 101 it will tell you what you need to know about cooling a 400w.

It was going to be a 400w and then a 150 below it. I have them both cool-tubed. I had a feeling I needed to scrap the canfilter9000 on ebay or something.

. Two Stage Cooling/Ventilation with cooltube and scrubber

LIGHTING CFM = 3.16*(Total Watts)/deltaT
where deltaT = 20 to 30 *F

VENTILATION = 1 - 5 Min/Ch (Minutes per Air Changes)

Intake Area = 2 x Exhaust Area for EACH section

Fans - Axial for Lighting maximum airflow, minimal pressure loss
Small blower, inline or axial for scrubber

Example: A 400 W HPS in a 3 x 3 x 4 cabinet with a ventilated hood needs 63 - 42 CFM of cooling for a 20-30*F temp rise in the exhaust temps with a 1-2 *F rise in the growbox. 5 Minutes between Air Changes requires only 7 CFM through the scrubber.

Pros:
unrestricted airflow through lighting allows fan to operate at maximum rated flow
low air flow rates allow for smallest scrubber
use of less expensive fans as design is more efficient
Lighting exhaust deltaT can be 20-30*F while maintaining low grow chamber temps
Much quieter as axial fans operate at 20-30 db compared to 60-70 for centrifugal fans

Cons:
more equipment
more intake and exhausts require more light proofing
ventilation design is more complex

- Would this be a better design for my setup so I don't have to scrap the carbon filter? (thanks for the fast replies btw)

 

[Harvest]

yes.

 

[big ballin 88]

If your going to run 2 400's I would suggest running the setup above, a fan for the two lights. It help use less energy overall since you wouldn't need as much in the end. Two 100cfm fans will be acceptable for each section i believe. That way you can leave the fan clearing the room to the scrubber. It doesn't matter if it slows down to much since the majority of heat is being pulled out by other exhaust fan.

 

[windsoft]

If your going to run 2 400's I would suggest running the setup above, a fan for the two lights. It help use less energy overall since you wouldn't need as much in the end. Two 100cfm fans will be acceptable for each section i believe. That way you can leave the fan clearing the room to the scrubber. It doesn't matter if it slows down to much since the majority of heat is being pulled out by other exhaust fan.

Its a 400 and a 150 mh probably below. The "setup above" is referring to what I copied from the other thread?

Any suggestions for fan brands? Quiet is a must. I was going to go with vortex as I had heard really good things about their reliability.

Maybe get a 449 and then speed control it down to 100 cfm? Any problems with doing that so I can keep a nice fan for future upgrades?

 

[big ballin 88]

Take a look at my album. I'm running a three stage stealth cab and may be of some use, even though its not updated. I use my top room as a utility room which houses the carbon filter and acts as a plenum. My flower area is ventilated through the Air cooled reflector and goes directly to the utility room via ducting. The veg room just has holes cut in the roof in order to provide an intake and equalize pressure.

I bought a 6" tjerlund fan since it was cheap and provided the best CFM in class for watts in case i move up to bigger things. This is extreme OVERKILL, however the bigger fan moving slower will move the same air a a 4" moving faster, which in turn equals lower sound due to less air velocity to achieve the same thing. The problem is a slight buzzing noise from the fan from being slowed down so much. Remember if using a speed controller to let the fan start up normal than bring it down, this eliminates some noise.

Sorry i didnt really look at the writing on your diagram , I rely on the text for the description of the cab and you put 2-400's instead of 1, unless i'm still not understanding something.

Are you using the 150w mh for veg? If so i'd suggest using PL-L's aka T5 biax, the ballast and bulbs are much cooler than MH so its would require less fan and give less hot spots since floros put the light output among the whole tube compared to the filament on the MH bulb..

Their cooler than the MH and IMO provides a nicer quality of light when combined. My avatar photo shows the SPD of Phillip's PL-L's. Than again its up to you, I like floro's for my setup for the reasons given..

One more thought to lower temps so you don't have to use as much power is using a CMH bulb. It doesn't throw heat like a normal HPS aka Heat lamp so running a ventilation setup like i have help keeps temps at a minimum. Not to mention the spectrum is much better and you can see your plants in a real life aspect.

If you have any more questions you can just write on my visitor messages so i can get back to you quicker...