How much air flow will be cut down from a carbon scrubber?

[Natural]

I'm worried about how much air flow is going to be cut down from a carbon scrubber... Right now I'm running a 400 HPS hood (with the glass, enclosed so you can hook up a fan to it) with a vortex 172CFM exhaust fan. I just built this cabinet, an upgrade from my tiny cab with a 150watt HPS in it.

How much air flow will be cut down from a small carbon scrubber?
I don't want to spend 100+ then come to find out I can't even use it because it cuts down too much air flow and my cab gets too hot.

I only have about 3 1/2 feet of actual plant height (including pots) that they can grow and I'm going to follow my medical marijuana rules of only 6 mature plants (I'm in California). I vent my exhaust under my house, so I was thinking that if the carbon scrubber cuts down too much air flow, I'll just run a dryer hose under the house to like the middle of my house where there are no vents around so smell can't get out, but I really don't want to squeeze my fat ass underneath the house...

Any input guys?
Thanks alot!

 

[Haps]

You should be able to do a thin one, think of a sandwich. Take a look at mine in the DIY linkorama to get a simple idea. I would be thinking thin, one crop cycle, and design something easy to change between crops. Have fun.
H

 

[OVERMAN]

can fans website shows the flow reduction. Think its usually 50-60%

 

[SDGUY]

It is going to depend on what filter you choose. Going with a larger filter is going to produce less of a pressure drop and a higher flow of air. The Can-filter 33 looks like a good choice. You must purchase a flange for it and a 4" flange is available. Here is the spec from the Can website:

Max Recirculating (Scrubbing) CFM: 400 cfm / 700 m³h
Max Exhaust CFM: 200 cfm / 350 m³h
@ 0.1 sec contact time
Recommended Min Airflow: 100 cfm / 175 m³h
Prefilter: Yes
Flange: 4", 6"
Dimensions: (with pre-filter)
·Outside Diameter: 30.5cm / 12"
·Height: 33cm / 13"
·Total Weight: 11.5kg / 25.3lbs.
·Carbon Weight: 7.5kg / 16.5lbs.
·Carbon Bed Depth: 5cm / 2"
Max Operating Temp: 80ºC
Pressure drop at max cfm: 180pa / .75"wg

Recommended Can-Fan:
Fan Watts Consumed Filtered Air CFM
Can-Fan 6" HO 137 Watts 232 CFM
Can-Fan 6" 81 Watts 178 CFM
Can-Fan 4" HO 78 Watts 130 CFM

The can-fan 4" HO has an output of around 155 cfm with no filter. To cool a 400 watt light multiply 400 x .3 to get 120 cfm. Using a cool tube type reflector you can probably get by with 80 cfm to get a 10 degree difference between lights on and lights off. I would say with your fan rated at 172 cfm you will have over 130 cfm. This should provide enough cooling but other factors come into play, such as the size of the passive intakes, the ambient temp of the air being pulled into the cab and how long a duct run you have. The longer the run the more resistance to airflow and thus the lower the cfm.

 

[Natural]

Thanks for the advice guys. I'm working on my cab right now. I'll post a pix of what I have set up so far and how everything works...

Thanks, peace!

 

[schwagg]

double the intake...... if you have a 4" exhaust you need 8" intake. makes a world of difference.

 

[Natural]

I have 4 4 inch holes drilled in my cab now... Still have to run the air conditioning in my room while the lights are on. Oh well. Temps are staying below 80F.

I'm thinking of buying an ozone generator instead of a carbon scrubber, cause there is no way cutting down air flow is an option...

 

[whodair]

if you have a vortex 4 pick up the profilter. that fan really puts out, and will cool a 400, even pulling through carbon.

 

[!!!]

How big is the grow space? I have a 400W and 240 CFM, and I definitely need to upgrade to at least 400 CFM. My grow space is small, 5x2x7 (70 sqft)