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Do I need an extra ntake or exhaust fan to create positive air pressure for my system?

sapped

37 months ago

Hey guys,

I’m thinking of adding more fans to my system, to cool my GPU and more importantly in controlling the amount of dust getting in to my pc case. Thus I’m hoping to set up a positive air pressure with more intake airflow than exhaust.

However I am confused with the following, because I’m using the massive Noctua NH-D15 CPU Cooler to cool my processor, it has two 140mm fans attached on top of the heatsink like this:

http://noctua.at/en/nh-d15.html

So I have a total of 4 fans (140mm) in my system, 1 intake in the front, 1 exhaust in the back, and 2 fans in between attached to my heatsink. What I’m wondering is, because I’m hoping to create the positive air pressure, does the 2 fans attached to my heatsink count as intake or exhaust?

I can’t find any definite info on this, I remember reading an article stating the CPU fans also affects the air pressure. So I’m hoping to ask you guys, do I need an extra intake or exhaust fan in my situation, to create this positive air pressure I’m hoping to achieve?

Thank you so much for reading and I appreciate your responses!

Comments

  • 37 months ago
  • 1 point

Your CPU fans are not intake or exhaust by the normal definitions. However, if they are moving air towards the rear exhaust fan they maybe helping that fan move a bit more air. That being said having one exhaust and one intake your airflow should be pretty balanced. You want to add an intake fan to get to positive pressure.

What case do you have?

  • 37 months ago
  • 1 point

The two heatsync fans don't count as either as they do not move air into or out of your case. For positive pressure you need an extra intake fan.

  • 37 months ago
  • 1 point

Ahh thank you so much for your help guys, appreciate it!

I'm using an Fractal Design Define R5, with dust filter in the front and bottom.

Just a question though, if I put the new intake fan in the bottom, does it suck in more dust than usual even with the filter?

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