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Hi everyone. So I recently built a new computer system. My case is the Fractal Design R5. It comes with 2x140mm fans. One in the front for intake and one in the back from outtake. I need to know the ratio of intake to outtake to maintain negative pressure. I can add one more 140mm in the front and one more 140mm on the side(it won't be filtered though). I also have Moduvent on the top which allows 3x140mm on the top. For negative pressure I want 1 intake for every 2 exhaust?

Edited by AllYourF0rt

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technically, negative pressure in any given room can be generated and maintained by having the air inside pulled out with an exhaust ventilation system, no forced air intake.

i preferred a balanced intake and exhaust ventilation system though, it's just me.

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So if I add one more 140mm intake on the front and two 140mm exhaust on the top it would be good? I would have two intake and three exhaust not including the PSU.

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that would be fine. are you having heat issues btw?

i have these 1 x 140mm, 1 x 120mm both at front intake, 1 x 120mm rear exhaust + 3 120mm top exhaust; my rig seems happy with it.

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nice! just have a good airflow inside that case and it should be alright. your ambient temp may vary though. but i'm absolutely sure you have a lot better ambient that mine, we're hitting the 40's here now :whoa:

how i hate our summer.

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