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Solved 120mm Case Fan Installation (SP vs. AF)?

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_Nick_

PCHF Member
Jun 21, 2017
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This is quite possibly the silliest and most embarrassing issue I've had crop up yet with my build, but I feel it necessary to rectify sooner rather than later, and am here for some expert input on case fan installation.

My current build has been working a treat so far, despite a few road bumps that were really just learning curves for it being my first build. The entire build is completed however at present there are no case fans installed, simply a fan on the CPU radiator. Without fans, my CPU tends to hover mostly around 60 degrees C on games like CS:GO, but I would much prefer if that temperature was as close to ambient as possible using fans. I've measured the case fan areas on the rear and top, each one is of a consistent size to fit a 120mm fan. I can't actually measure the front section though, because the front of the case doesn't seem to come off at all, and I can't reach inside to measure the grate where the fan goes without removing the side panel. That's where the first of my issues lies: I don't exactly know how to install an effective fan for air intake that will give me the best results. Based on the case design, air can come in from either the top or bottom slots of the front of the case, but there doesn't seem to be all that much room. Based on this, would it be wise to install a static pressure fan to force more air in? This leads to the next part. I can very easily install a static pressure fan on the rear slot behind the CPU radiator to keep that flowing, and I imagine I can also install a static pressure fan on the top of the case as an exhaust fan. They are both in proximity to CHA_FAN1 on the MOBO (Asus Prime B250M-Plus) which is a 4 pin, so will I be able to join them with some form of adapter to plug 2 exhaust fans into 1 port? I can only see 2 fan ports on the board since CPU_FAN is already in use, and the user guide provided states that there are only CHA_FAN 1 and 2. I would have liked to have 2 intake fans and 2 exhaust fans for optimal airflow, but because of the curveball that the front of the case threw me, I'm not sure what would really be best. Case specs specifically state:

Cooling Front: 3 x 12cm Fan (Not Included)
Cooling Top: 1 x 12cm or 1 x 14cm Fan (Not Included)
Cooling Rear: 1 x 12cm Fan (Not Included)
Cooling Side: 2 x 12cm Fan (Not Included)
Cooling Bottom: 2 x 12cm Fan (Not Included)

So, what's the best solution? Would I benefit from static pressure intake fans on the front to counter the obstruction, or is the design specific enough that airflow is actually suitable on it's own? Also, how does one exactly install 3 12cm fans on the front given the obstructions? The HDD sits at the bottom so it is isolated from the airflow area, and by estimation the grate on the front interior seems to fit at most a 14cm radiator, with design to accommodate a 12cm one in it's place. This case and it's listed specs are awfully confusing, and have really thrown a wrench in the works, so much so that I just bypassed it instead of holding off on the build until such times as I had a solution. I can't really go about replacing the case because I'd need to move all of the contents over which is tedious and will cost me even more. You can find attached some photos I took myself of the interior as well as the stock photos from a site I found that listed specs of the case. Any solutions for me?
 

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Find attached the PDF from the manufacturer regarding the ports, chassis fan header in particular. I've not experienced a 4 pin PWM port like that before, so am I correct in understanding that the 2nd pin from the right should be a 12V supply, and the +5V on the far left is for PWM signal? And, if so, how will I split my fans for the exhaust to ensure no damage to the MOBO from excessive power draw? The manufacturer has been rather unclear on this info, but I don't know if there's software that could tell me the numbers so i could move past it.
 

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You will never damage your Motherboard from excessive power draw.120MM have so little current draw.
The fans vary from 0.2 to 0.4Amp on average, which is so little.
I have rigs running up to eight X 120mm fans.
We are talking in Amps, not volts.
You are worrying too much.:)
 
You will never damage your Motherboard from excessive power draw.120MM have so little current draw.
The fans vary from 0.2 to 0.4Amp on average, which is so little.
I have rigs running up to eight X 120mm fans.
We are talking in Amps, not volts.
You are worrying too much.:)

My main worry over this arises from what I've previously heard about PWM ports. I assume it runs at 12V with a +5V pin (the +5V pin was listed in the manual but the actual voltage or amperage was not) and so I was unsure how to connect a series of PWM fans together off of the motherboard, and when I heard that they usually max at 1A, I was concerned that I could really damage it. My motherboard isn't warranty covered for that, and since most people recommend powering a fan from molex on the PSU (which is awkward to do atm because of the case design), I thought maybe I should just settle for MOBO fans. Then, I was told that the sensor in one needs to be cut if you connect 2 to a single port otherwise the automatic PWM will misread and go excessively high. It's all just so much that I'm overwhelmed, and quite honestly I just need it in as simple terms as possible. Seeing as the manufacturer didn't provide any info on the power, am I at least to assume 12V is provided to all PWM ports? And, if that is the case, do I assume it's 1A on the header? I wanted to run static pressure because of obstructions, but I thought they drew MUCH more than airflow does.
 
Any updates for us?

Buying 4 static pressure fans (max of 3.04 mm H2O with 79.13 CFM) and some PWM Y splitters to run from the motherboard. Contacted the manufacturer and the power draw is about 1.56W so DOUGIE was right in saying that the power draw will be minimal enough for me to run exhausts and intake all from the MOBO.
 
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Are you talking about the honeycomb mesh on the side panel.? (Removable side cover)

No, I'm not putting anything on the sides because the removable panel is glass so I can see in. The honeycomb mesh is on the top of the rear end just behind where my CPU radiator is, and it's also on the top of the case right above that radiator, and on the front. The mesh covers the height of 2 fans on the front but it's lower down, just above where my hard drive and solid state drive are located. I plan to do 2 intake fans that are static pressure to overcome the honeycomb mesh obstruction, and 2 static pressure exhausts on rear and top to draw heat out with more force and bypass the mesh.
 
I just had a look at your case. This is the way I set the fans up, and always have good cooling.
View attachment 3265

Yep that's exactly what I had in mind. Just not sure what to do about what I assume is the optical drive slot at the top front of the case (the one with vertical grills). I imagine I can remove them somehow, but I'd need the top one there for the mounting hole for the fan. Would that be too much of an obstruction if the top one remained on a 120mm SP fan? If I'm being honest, this case isn't really all too smart in design.
 
I meant two fans in the front, if there is already provision.
One fan in the front, instead of two still cools well.
Most important is to have a good heatsink fan on the cpu.
Aftermarket air coolers are cheap.
 
I meant two fans in the front, if there is already provision.
One fan in the front, instead of two still cools well.
Most important is to have a good heatsink fan on the cpu.
Aftermarket air coolers are cheap.

Already have a Be Quiet! Pure Rock BK009 using a static pressure Pure Wings 2 to vent the air through it, so the heatsink is no worry. I just need the fans to ensure optimal conditions and a constant supply of cool air because I want the build to last a few years and ventilation might be a problem given it's position near the corner of the room. If I only put one in the front, will it still be OK to put 2 in the rear? I don't know much about how to deal with pos/neg pressure.
 
No tower that I have seen has provision for 2 fans in the rear.
I build computers all the time. It will cool ok with one fan in the rear.
When you build, take note of hardware temps, and if there is an issue we will deal with it then.
I have nine computers in the house.LOL
Must go now, near midnight here.
 
No tower that I have seen has provision for 2 fans in the rear.
I build computers all the time. It will cool ok with one fan in the rear.
When you build, take note of hardware temps, and if there is an issue we will deal with it then.
I have nine computers in the house.LOL
Must go now, near midnight here.

Jeez, that's a lot of computers. Cheers for the help, I'll get to work on installing 1 intake and 1 exhaust, and then based on the results I'll be back to see if there's some room for improvement. I always thought more fans = better cooling, but the proof is in the pudding, it seems. Time to go place an order.
 
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