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Where should I place my fans?

SKR25
By SKR25
in Cases and Mods
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I just bought the Fractal Meshify 2 Mini case to round out my PC build and wanted some opinions on how to do case fan placement.

My PCPartPicker list

I was debating between mounting the two 140mm fans on top or on the front. I can't decide between these two possible configurations and want some advice.

 

Top-mounted 140mm:

Intake:

69.17 × 3 = 207.51 CFM

Exhaust:

52.3 + (68.4 × 2) = 189.1 CFM

 

Front-mounted 140mm:

Intake:

(68.4 × 2) = 136.8 CFM

Exhaust:

69.17 × 3 = 207.5 CFM

 

For either config, I can purchase another fan and mount it as an intake on the bottom, provided I remove the 3.5" HDD cages (I don't plan on using them anyway)

SmartSelect_20220812-160324_Acrobat for Samsung.jpg

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10 minutes ago, SKR25 said:

I just bought the Fractal Meshify 2 Mini case to round out my PC build and wanted some opinions on how to do case fan placement.

My PCPartPicker list

I was debating between mounting the two 140mm fans on top or on the front. I can't decide between these two possible configurations and want some advice.

 

Top-mounted 140mm:

Intake:

69.17 × 3 = 207.51 CFM

Exhaust:

52.3 + (68.4 × 2) = 189.1 CFM

 

Front-mounted 140mm:

Intake:

(68.4 × 2) = 136.8 CFM

Exhaust:

69.17 × 3 = 207.5 CFM

 

For either config, I can purchase another fan and mount it as an intake on the bottom, provided I remove the 3.5" HDD cages (I don't plan on using them anyway)

SmartSelect_20220812-160324_Acrobat for Samsung.jpg

I'd say the 1st option myself.  More cool air in.

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Where do your numbers come from?  WHy do the 140's on top have more CFM per than the front, are you saying the 120's have more CFM than the 140's?  Did the manual outline this due to the mesh filters?

 

 

 

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25 minutes ago, SKR25 said:

I just bought the Fractal Meshify 2 Mini case to round out my PC build and wanted some opinions on how to do case fan placement.

My PCPartPicker list

I was debating between mounting the two 140mm fans on top or on the front. I can't decide between these two possible configurations and want some advice.

 

Top-mounted 140mm:

Intake:

69.17 × 3 = 207.51 CFM

Exhaust:

52.3 + (68.4 × 2) = 189.1 CFM

 

Front-mounted 140mm:

Intake:

(68.4 × 2) = 136.8 CFM

Exhaust:

69.17 × 3 = 207.5 CFM

 

For either config, I can purchase another fan and mount it as an intake on the bottom, provided I remove the 3.5" HDD cages (I don't plan on using them anyway)

SmartSelect_20220812-160324_Acrobat for Samsung.jpg

Make sure you have neutral pressure (so as many fan in as fan outs) or positive pressure. Otherwise you have a dust collector on your hands

 

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38 minutes ago, Dedayog said:

Where do your numbers come from?  WHy do the 140's on top have more CFM per than the front, are you saying the 120's have more CFM than the 140's?  Did the manual outline this due to the mesh filters?

 

 

 

I pulled those CFM numbers from PC Part Picker and they're subject to change based on air filters. Iirc, the front, top, and bottom of the case all have filters.

Sorry if it was unclear, but in both configurations, I was including the 120mm rear exhaust fan in all my exhaust calculations. That's why the 140mm top config had a higher CFM. It's the CFM of the two 140mm fans as well as the one 120mm rear exhaust, whereas the front-140mm config just uses the two front 140mm fans as intakes.

Essentially, all of the numbers are going to be lower in practice due to the mesh filters in the top, bottom, and front, since that would probably make a difference.

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43 minutes ago, Quickstrike said:

Make sure you have neutral pressure (so as many fan in as fan outs) or positive pressure. Otherwise you have a dust collector on your hands

 

Can neutral pressure be achieved by just having an equal number of intakes vs exhausts, or do I have to try to equalize the CFM as much as possible?

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IMO if yer look for CFM, 140 will be better

on radiator 120 typically has better static pressure

 

i would go with two 140mm front intake, two 120mm on both rear & top as exhaust

 

slight positive pressure is good for keeping dust out of gaps,

i test using incense sticks near panel gaps, if the smoke is not being pull into the pc then yer good

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