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Is one exhaust fan enough for a watercooled build?

post #1 of 9
Thread Starter 
Hello guys. I'm planning a watercooled build in CaseLabs Merlin SM5 case, with 360mm rad on top and 240mm rad in the front panel, both will be in pull config. I'm wondering if only one exhaust fan is enough for the set up. Thanks in advance. smile.gif
post #2 of 9
Yeah, it'll work. You'll have positive pressure in your case as long as you have more intake than outtake. However, be aware that too much intake over outtake could unbalance the back fan due to toomuch forced airflow being pushed out, which can lead to your back fan making nonoise.
post #3 of 9
Thread Starter 
So in the case of too much intake over outtake, I assume changing to a more powerful exhaust fan will eliminate the noise?
post #4 of 9
Thread Starter 
So in the case of too much intake over outtake, I assume changing to a more powerful exhaust fan will eliminate the noise?
post #5 of 9
Quote:
Originally Posted by KennyHJK View Post

So in the case of too much intake over outtake, I assume changing to a more powerful exhaust fan will eliminate the noise?

You'd have the chance to, as there won't nearly be as much pressure bearing down on the exhaust fan as it'll be able to pull more air out of your case. However, there is still a highly likely chance of you unbalancing that rear fan with as much intake as you plan on doing.

My rule of thumb is at least 1 more intake over outtake. That way you have positive pressure inside of your case to prevent dust buildup, and you'll also not be putting too much pressure on your exhaust fan to actually unbalance it.
post #6 of 9
I have 280 rad in front + 120 fan on hard drive in front and 360 rad in top, all intaking air, ie equivalent of over 6 x 120 fans intaking air, and a single fan expelling air. The rear fan worked fine for 5 years had it set up that way. If fan makes noise, the fan is bad. The excess intake will just leave via fan hole, or other holes, our dinky fans wont cause enough pressure to disturb another fan...unless maybe 1 inch from it.

While ideally you want just little more intake than exhaust to reduce air resistance through rads, it is still better cpu temps to have unbalanced airflow but use cooler external air for rads, vs balanced but internal air for rads.
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post #7 of 9
Quote:
Originally Posted by opt33 View Post

I have 280 rad in front + 120 fan on hard drive in front and 360 rad in top, all intaking air, ie equivalent of over 6 x 120 fans intaking air, and a single fan expelling air. The rear fan worked fine for 5 years had it set up that way. If fan makes noise, the fan is bad. The excess intake will just leave via fan hole, or other holes, our dinky fans wont cause enough pressure to disturb another fan...unless maybe 1 inch from it.

While ideally you want just little more intake than exhaust to reduce air resistance through rads, it is still better cpu temps to have unbalanced airflow but use cooler external air for rads, vs balanced but internal air for rads.

I also have had several setups with multiple intake fans on radiators. You cant really do this with pull but for example with push if you put your hand on the other side of the radiator very little air is getting through it compared to what the fan would have been doing if it had nothing blocking it.

So in other words 5 fans used for intake through radiators is not equal to 5 fans. Or even 3 fans.

Pushing the air through the radiators would be the better bet if you could manage to configure it that way. Either way you are making the right decision to get the air from outside the case.
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post #8 of 9
yep givemedew, totally agree, and have made the same argument myself regarding air through rad vs standalone fans. I have push/pull, but even that takes multiple fans on rads to equal airflow of 1 standalone fan.
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post #9 of 9
Quote:
Originally Posted by opt33 View Post

yep givemedew, totally agree, and have made the same argument myself regarding air through rad vs standalone fans. I have push/pull, but even that takes multiple fans on rads to equal airflow of 1 standalone fan.

I was just backing up what you said. So he had 2 people saying it smile.gif

Lots of people will say otherwise and lots of people will say to exhaust your case air through your radiator (NO WAY).
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