Fans for Small Stealth Grow Box

w33dh33d · #1 06-28-2007, 08:48 PM

So I went and bought some fans for my stealth grow box. See my grow journal link on my signature below.

I bought two 80mm fans which fit snugly over my 4" holes.

There is one at the top for exhaust (hot air at the top), and there is another one at the bottom for intake. It is conveniently located beside my A/C duct.

The fans are rated at 12V, 500mA, and shuffle about 35 cfm. This is a complete exchange in my 2x2x4.5 box about every 30 seconds. Ideal

.

I bought an unregulated 12V power supply for them and rigged them in parallel. The power supply can handle 1A, so this also is perfect. I suppose if I wanted to get anal about it, I could build a regulating circuit for another few bucks, but at 16V, I'm pretty sure the reduced lifetime of my fans will not occur during this grow. I may even upgrade in a couple months to 100mm (4") fans.

I plugged it into my timer circuit, so the intake and exhaust fans will only go during the daylight hours. I wonder if this is an ok idea, or if they should be ventilating 24/7.

I also bought a $5.00 desk fan to keep the air circulating inside the grow box.

Enjoy the pics... comments welcome!

gillard · #2 06-28-2007, 09:40 PM

very nice im setting up a space almost the exact same and was wondering how many plants are you currently/planning to grow in there?

UserFriendly · #3 06-28-2007, 09:56 PM

if you keep the fans on 24/7 you won't have to worry about mold.

w33dh33d · #4 06-28-2007, 10:49 PM

Hi there, it's going to be a one plant operation for this round. If this plant is nice, I'll probably clone and grow more in the space. I have a feeling that I can grow 1 big fat one, or 4 tall skinny ones in there. Check out the box at http://www.rollitup.org/grow-journal...box-build.html

UserFriendly, good idea about the fans. I will be leaving them on 24/7.

kalm325 · #5 10-07-2008, 01:47 PM

where did u get those fans and for how much

w33dh33d · #6 02-01-2009, 07:25 AM

Sorry for the late reply.
I got the 12VDC fans at an electronics supply store. They were only a few bucks. The wiring is low gauge telephone wiring (or something similar, just read the writing along the side of the sheathing).

I also got that same power supply there. It's an unregulated 1A - 12V power pack. I just snipped the ends off and used my multimeter to determine which wire was postivie and which was negative.

hehehe3 · #7 02-15-2009, 03:14 AM

I don't know if you are lining the interior of your box with anything, but 1) reflective plastic mylar, 2) shiny white paint, or 3) aluminum foil will all increase the effectiveness of your lighting. (I use bubble-wrap insulation coated with reflective metal similar to aluminum--available at hardware stores).

w33dh33d · #8 02-22-2009, 01:11 PM

This posting was from my first grow. I'm on my second generation grow, and am now using mylar. I notice a HUGE difference already.

w33dh33d · #9 04-13-2009, 07:22 PM

And the original fans are still doing the trick.

dopeadope · #10 11-09-2009, 07:57 PM

What are u using for the power supply? can you post a pic? or send me and email?

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