So in my PC grow box I have a 140mm 88 cfm axial fan situated at the front near the bottom of the case, a high side 120mm 78cfm intake blowing directly on the plant, and a rear 120mm 78cfm exhaust. Temps and humidity are stable, but I'm in a battle against odour and I need to win. If you noticed my intake is much greater than my out take, will this result in positive pressure? Will air just flow out any crack and smell break loose? I'd imagine if I don't have negative pressure my carbon scrubber would be deemed useless? I need to find a situation for these fans that provides optimal ventilation and negative pressure.
Negative pressure question?
- Thread starter moarpheus
- Start date
shrxhky420
Well-Known Member
bigger exhaust than intake... maybe use both fans as exhaust and passive intake, Put your exhaust at top of the case and intake at the bottom, remember heat rises. stay high
shrxhky420
Well-Known Member
try making them both exhaust. you want that neg pressure, right? you should order yourself some ona gel as well... just poke a few holes in the lid and leave in your pc case, this with your scrubber should work to eliminate smell. good luck stay high
shrxhky420
Well-Known Member
Yes use the 140 for exhaust as well and use your vent for passive intake
?
shrxhky420
Well-Known Member
Um... yeah, but you can make your own for very cheap, I saw a thread on here the guy used a pencil cup and nylons to make a scrubber
shrxhky420
Well-Known Member
you want exhaust not intake.... here is a link to the DIY carbon filter. https://www.rollitup.org/do-yourself/101248-best-diy-ez-walmart-carbon.html
this should work for you, let me know what you think
this should work for you, let me know what you think
I don' t think i'm going to work with passive intake however, so I need that intake. A 120mm intake and exhaust would work would it not?
shrxhky420
Well-Known Member
More exhaust than intake, that way you can create neg pressure.
I think it's a 2:1 ratio, but I'm not 100% sure on that. Say you have 6" of exhaust you only want 3" of intake. if you go active intake make sure it's a lower cfm than your exhaust.
With what you have I would use the 140mm for exhaust and the 120mm as a cirrcuculator and stay with passive intake. That's just me.
I think it's a 2:1 ratio, but I'm not 100% sure on that. Say you have 6" of exhaust you only want 3" of intake. if you go active intake make sure it's a lower cfm than your exhaust.
With what you have I would use the 140mm for exhaust and the 120mm as a cirrcuculator and stay with passive intake. That's just me.
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