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Can you mix fans on radiators?

Can I take say...an H150i, keep the set that comes on it, but put another set of 120m fans for push pull? or do they all need to match specs?

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A second set of fans won't make much of a difference, just more noise.

Also it's ideal if they are matched, better performance and less noise, but no they don't need to be.

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You dont have to match them, but do make sure they are equally capable.

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1 minute ago, Enderman said:

A second set of fans won't make much of a difference, just more noise.

Also it's ideal if they are matched, better performance and less noise, but no they don't need to be.

 

1 minute ago, Jurrunio said:

You dont have to match them, but do make sure they are equally capable.

Thanks!

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21 minutes ago, Masters2150 said:

Can I take say...an H150i, keep the set that comes on it, but put another set of 120m fans for push pull? or do they all need to match specs?

I always try to, as previously stated, match the sets of fans on the push side and the pull side. They don't need to be identical, but it is better. If this is not possible, then try to find the fan specs and get the max static pressure. You can then scale it down in a ratio to see how fast the other pair of fans has to spin to match this. If you don't have a problem with money, then obviously buy 6 fans. I would always recommend Noctua or, my personal favorite, Noise-blocker BP12-PS. Also, on a side note, if you plan to buy only three fans, buy corsair ones, that match in specs. Usually you can pick up another set of the same fans for cheap. Go to Corsair, then accessories, and then find the fans. 

 

Best,

Django 

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2 hours ago, Masters2150 said:

do they all need to match specs? 

not particularity,  its important to consider FPI when you buy more fans for you Rad,   im not sure but i think the h115i has a mid range density, (some one correct me if i am wrong)  and to realize that  the fins reduce air flow, thats why you need the static pressure,  when adding a fan to the other side you don't necessarily double performance, or even move more air, although you will likely move the highest rated CFM  total in the end (measuring this would be hard)  the added fan on either side in both case's will just aid in removing the fins air resistance.  you cannot add the CFM together in this situation, but the  added fan helps over come turbulence and backflow of air

 

if you do get mis-matched specs i am not even sure what setup would benefit (or if wither would): strong fan pulling or pushing.   but the stronger one will be the max airflow.

what may be a better idea is just to add the fan as intake some where if you can and use the current fan as pull-exhaust

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Mixing fans isn't necessarily bad and can actually be beneficial to both performance and acoustics. The part regarding acoustics is complicated and determining the result will most likely require testing but mixing fans can reduce harmonics that would otherwise occur with just a single set. 

An example from NCIXTechTips shows the H75 performing better with a SP120 in push and AF120 in pull: 

This combination works well because static pressure optimized fans are designed to prevent leakage and focus the air through the fins whereas airflow optimized fans just need to move a large volume of air which happens to already be straightened by the fins. It's the same reason why I have a NF-S12A in pull behind my NH-U12S instead of a matching NF-F12 and related to why static pressure optimized fans usually perform notably better in push than pull.

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You can do what ever you want. It’s yours. 

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On 10/13/2018 at 8:18 PM, Enderman said:

A second set of fans won't make much of a difference, just more noise.

you actually need to have 10 fans running at the same speed to double the noise of one fan  so just adding 2 fans should hardly be noticeable if you on,y have like 4 or 5 already 

 

but that part about it not being worth it or the dimishing returns is pretty true 

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