[nepalnt21]

not a sticky? how's that work???

good thread

bump

[Black Sheep]

well iv put my cab on the back burner for a while. i ran across a 4.4 cubic foot mini fridge and cant decide on the ventilation. would 2 41cfm fans side by side be suffecient enough 2 keep the temps down? i stil havnt decided if im going with a 150 watt hps or 200 watt cfl. so temps could become an issue as far as the hps goes. not realy sure how much heat the 200 watt cfl puts out and id rather over do the ventilation than not enough. i should have some pics posted of the mini fride with in a couple weeks when i start the demo and reconstruction. this will be my first build so keep your fingers crossed.

[Black Sheep]

if anyone thinks that another cfm rateing would work other than the 41 cfm feel free to educate me. the intake will most likely be an 8"x8" darkroom vent and the air will be scrubbed thru a 12"x12"x2" square scrubber. if this info even helps to help determine.

[phr3d0m2gr0]

Black Sheep: Are the fans PC fans? could possibly post a drawing or link to the style of scrubber your going to use? Most likely the two fans side by side won't have enough "sucking" power to pull through a darkroom vent AND scrubber and still be able to keep temps down.

I'm not totally sure, but the CFL's might be cooler and a better option if your concerned about keeping temps down. Plus you could always reduce the CFL wattage if the temps do become too much of a problem, whereas you are stuck with what you have with the HPS.

[Black Sheep]

thanks for responding phr3d0m. the fans that im thinking of useing are the dayton axial 115 volt. i cant seem to find the scrubber that i spoke of earlier. i thought that i originally seen it on Anti's grow cab 3000 thread. Hydro-Soil posted about the panisonic whisper fan and i could swear that he posted pics of the scrubber that he used with it.

i would post a drawing but unfortunately im a complete noob and i dont know how to.

the reason i was thinking of such a high wattage for the cfl is that il be scrogging and i want to make sure that i get plenty of penetraton into the canopy. iyo do you think that im makeing a mistake going with such a high wattage in the small area?

hopefully il be able to begin working on the fridge next week. il be takeing pics through out the construction and i will figure out how to post them. iv got so many differrent ideas for it and could definitely use the advice from the pros.

[phr3d0m2gr0]

I don't think the CFL wattage would be too high as long as you can ventilate it properly. If you take a look at some of the CFL grows on here you can see people running fairly high CFL wattage's with a surprisingly low amount of ventilation. Also, if possible try to put the fridge in the coolest part of your house. This will help reduce the amount of ventilation you will need.

Hey guys, it's been a while since I checked out my thread. It seems to have a life of it's own!!!

Black Sheep - take a good look at Freezer Boy's fridge cab. He's done an awesome build. Anti has a good NGB multichamber design.

There are three basic cab designs in use on this forum. Each has their own characteristics. Make a good choice and run with it.

1. Simple Cab - one chamber, no scrubbers or restrictions to airflow.
CFM = 3.16*Watts/deltaT
Intake Area = 2 x Exhaust Area
Fans - Axial/Computer Fans due to minimal pressure loss

2. One Pass Scrubber - may incoporate cooltube and multi chambers
CFM = 3.16*(Total Watts)/deltaT
Intake Area = 2 x Exhaust Area
Fans - Blower or Inline for high pressure drop across scrubber
Pros: single fan design less equipment to purchase
cooltube allows for lower CFM operation as exhaust deltaT
can run 30-40 *F as heat is concentrated in tube.
Cons: fan operates at 50% or less airflow due to pressure drops
2x or more oversize to get base airflow
many restrictions in multi chamber designs
scrubber/fan combo usually undersized
high airflow for lights creates stress on plants
high airflow through scrubber reduces effectiveness
Blower and Axial fans are noisy 60-70 db

3. Two Stage Cooling/Ventilation with cooltube and scrubber
LIGHTING CFM = 3.16*(Total Watts)/deltaT
VENTILATION = 1 - 0.2 ACM ( Air Changes per minute)
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

Pros: unrestricted airflow through lighting allows fan to operate at
maximum rated flow
low air flow rates allow for small scrubber
use of less expensive fans as design is more efficient
Lighting exhaust deltaT can be 30-40*F while maintaining grow
chamber temps
Much quieter as axial fans operate at 30-40 db
Cons: more equipment
more intake and exhausts require more light proofing
ventilation design is more complex with ducting (R2D2)

Originally Posted by Black Sheep

well iv put my cab on the back burner for a while. i ran across a 4.4 cubic foot mini fridge and cant decide on the ventilation. would 2 41cfm fans side by side be suffecient enough 2 keep the temps down? i stil havnt decided if im going with a 150 watt hps or 200 watt cfl. so temps could become an issue as far as the hps goes. not realy sure how much heat the 200 watt cfl puts out and id rather over do the ventilation than not enough. i should have some pics posted of the mini fride with in a couple weeks when i start the demo and reconstruction. this will be my first build so keep your fingers crossed.

[phr3d0m2gr0]

redgreenry: With the two stage design do you mean to say that each chamber would be vented separately and the lights would also be vented separately?

So for example, say you have a cooltube in a single chamber for flowering. That would mean the entire ventilation of the cabinet would contain:

• A single fan would ventilate the light. It would be a flow through system with no scrubber
• A single fan would ventilate the grow chamber. This would have a carbon filter, but it would be divided into two stages to allow for minimal pressure loss.

Is that correct?

-Phr3

[Black Sheep]

phr3d0m: ok thanx for that info. il try the 200 watt and see how that works out. i think that im going with 2- 70 cfm 115 volt ac axial fans for the ventilation to help with goin thru the dark room vent. the location of the fridge will be in the basement so it should have plenty of cool air.

redgreenry: freezerboys set up is nice but il be useing a mini fridge with 4.4 cubic feet and will have 2 deal with space constaints. its the 1st mini fridge that iv seen with a seperate freezer. i cant decide on wether or not i want to use the freezer as the utility room or if i should make it a mother and clone room. decisoins decisions. im working on trying to figure out how to get the pics from my camera to my laptop and then posted here. but when i do i think everyone will have a better idea of what im trying to do.