Static Pressure in a LifeLess style Rubbermaid Tub

[Max0r]

Hey ICmagers,

I have 4 girls (707HB and Hindu Skunk) in a 25gal LifeLess-style rubbermaid setup. One tub flipped on top of the other.
Currently running 252watts of mixed 65k/27k CFL. This last weekend I went over to WalMart and got the supplies I needed to build sugarbear's Micro scrubber (pencil holder edition).

After assembling the scrubber, I duct taped it to my 4" ABS exhaust pipe and quickly realized that I had lost a significant amount of airflow from my 90mm PC fan.
Tub temps quickly got up to close to 90 degrees F so I had to yank it.

I am considering picking up a 4" duct-booster fan. I realize this is not the same as a centrifugal fan or blower, but do you think that the 60CFM of free air power
it has would be enough to overcome the static pressure in my tub and provide good airflow across the lights and through the scrubber?

I would get a 4" blower but they all seem to be close to 200CFM and that seems like overkill?

Anyway, thanks for the advice!

 

[guest 77721]

Hi MaxOr,

I'm very familiar with the Sugabear Scrubber which is good for low airflow scrubbing. You need a scrubber with more surface area that will pass a higher airflow.

I have a 252W Rubbermaid design that is cooled with a 38CFM computer fan and a 10CFM Scrubber. My 150W HPS cab has a similar design.

Red Greenery's DIY Rubbermaid
http://www.icmag.com/ic/showthread.php?t=31605

Red Greenery's 150HPS Cabinet
http://www.icmag.com/ic/showthread.php?t=51189

Ventilation 101 by Red Greenery
http://www.icmag.com/ic/showthread.php?t=112862

 

[Max0r]

Red,

Thanks for taking the time out to school me on some of this.
I just got done reading your epic Rubbermaid thread and have sadly realized my design flaw.
I am only using 1 fan to exhaust and scrub when there should be two.
So now I have to ponder how to properly integrate the scrubber into the system.

Currently I have EXHAUST <- FAN - TUB <- INTAKE and I am trying to avoid making the mistake of
just blowing the exhaust through the filter as I have read pulling is much more effective. Do I even have that option?
I don't have the space to put the scrubber inside the box and pull through it nor do I think a single fan is going to be able to cool all of the CFL's.
Would it make sense to put a fan on the intake and try and push a little more air through to the filter or
should I just throw a PC fan in there and point it at the lights?

Do you think something with a lot more surface area like a Can2600 would work with my single fan?

I would just scrap it and start over but my girls are already close to the top of the "bottom" tub and I would hate to have to waste these super healthy ladies.

Thanks again!

 

[guest 77721]

I think the best solution is to separate the lights with a sheet of glass and cut a new intake in the light section. Put the sugabear scrubber in the grow section with a second fan.

If you're running 4 x 42W lights you will need around 50 CFM to cool them in the light section and about 10 CFM in the growbox. I think the sugabear filter should be good for 10.

 

[Max0r]

Thanks red!