PC fan ventilation for cfm setup

growVA

Member
I'm finishing up my first grow and soon to be starting the next. I am running 600w HID in a tent but I recently found a cabinet that I think would be perfect to convert to a little ScrOG setup so I'm going to try that out. To save on fan noise I'm going with CFLs. (4 65w 6500k for veg and 4 85w 2700k for flower.)

The cabinet I picked up at a thrift store and already has a good setup that requires just a little work. It appears to be some sort of entertainment center so it has a hole at the top and bottom for cords. I was hoping to convert these to vents and run PC fans to save on the noise. The problem is they're only about 2" diameter so I don't know if a fan that size will circulate much air. Around how much CFM will this setup require? I can cut the holes bigger but they seem perfect and are already lined with black rubber to prevent light leaks. Also I'd like to avoid as much woodwork as possible lol. I'll post pics of it when I'm home if it helps
 
Without dimensions it's hard to say but here is my experience with a small box 21x27x44 inches running 4-26 watt cfls atm, the temp 1 inch from plant is 23C and 21C 2 feet up. I am currently running an 80 cfm bathroom fan which is fairly quiet, with no air being pushed in, 3inch dia vents, one in one out.
 

growVA

Member
sorry I forgot the dimensions its 28x23x48".. pretty much exact same as yours.. im thinking now about working with a bigger fan and creating a duct reducer type deal to take it to the size I need for the holes. what do you think? also you said you have no air being pushed in, do you have any passive intakes or are you just letting the air that naturally leaks in through the cracks work?
 

glockdoc

Well-Known Member
hey VA yea u can do that. do what u want to do no intake fan so its passive. make sure ur intake holes equal double ur exhaust size
 

jondamon

Well-Known Member
I built a motherbox with similar dimensions and I used AKASA APACHE PWM fans.


I used a 55CFM version as an intake and a 80CFM one as an exhaust.

Kept 200w of cfl cool. Hi's of 26C and lows of 22C.

I rigged them both up to the same 12V DC power adaptor from an old broadband router.


J
 
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