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Mounting a second fan on the back of the case (Antec SLK3000B)

With the summer approaching, I am making some experiments trying to cool my pc as much as possible while keeping it quiet. Now, airflow in the case is made by 2 fans: the intake fan, a Papst 4412 F/2GLL, pulls air inside the case from the front, the exhaust fan, a Antec Tricool coming with the SLK3000B, pushes air out to the back; in addition, the psu fan pulls air from the top of the motherboard through the psu to the back.
Since I bought a second Papst 4412 F/2GLL, I tried positioning this fan in different locations to see which one conributes the best to the cooling. One of these is the back of the case, in the bottom, where there would be additional cards: it pushes air out of the case through the back slots.

Fans

Intake by one Papst 4412 F/2GLL (front, bottom)
Exhaust by the Antec Tricool (back, top) and the second Papst 4412 F/2GLL (back, bottom)

All fans are set at low speed, the Tricool by its speed switch and the two Papst by the fan controller (the front one by a speed knob, the back one by a 5V/12V toggle switch).
CFM balance: -30 CFM (negative pressure; expected: even more cooling, pulling dust inside through the side vents)

Papst 4412 F/2GLL
I had to retrieve its specifications from the net because it came without any package: from silentpcreview:

Voltage
Noise
RPM
CFM
Power
12V
24 dBA@1m
1290 RPM
54 CFM
0.64W
9V
20 dBA@1m
980 RPM
40 CFM
0.48W
7V
<19 dBA@1m
750 RPM
30 CFM
0.38W
5V
<19 dBA@1m
490 RPM
18 CFM
0.30W
@25 CFM (6.2V)
<19 dBA@1m
660 RPM
25 CFM
0.35W
Antec Tricool
I retrieved its specifications from silentpcreview too because it came with the case:

Voltage
Noise
RPM
CFM
Power
12V (High)
36 dBA@1m
1930 RPM
73 CFM
2.73W
9V
29 dBA@1m
1530 RPM
58 CFM
2.00W
Medium
27 dBA@1m
1430 RPM
53 CFM
1.90W
7V
23 dBA@1m
1220 RPM
45 CFM
1.54W
5V (Low)
20 dBA@1m
870 RPM
30 CFM
1.18W
@25 CFM (4.5V)
~19 dBA@1m
740 RPM
25 CFM
1.00W

Mounting

I removed all the backplates from the back of the case (the air will flow out through them), the fan will be fixed to the case using two of them. Since they are too short to screw a 120 mm fan on them, I had to make two extenders onto which the fan is screwed: the pics are self-explanatory.

Back fan 1.jpg
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Back fan 2.jpg
82.37 KB
Back fan 3.jpg
84.80 KB
Back fan 4.jpg
94.42 KB
Back fan 5.jpg
139.24 KB
Back fan 8.jpg
146.45 KB
Back fan 9.jpg
118.46 KB
Back fan 10.jpg
108.25 KB
Back fan 11.jpg
159.27 KB
Back fan 12.jpg
107.33 KB
Back fan 13.jpg
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Results

The temperature of the motherboard, the hottest component, still reaches 47 with cpu at 100%, with and without the third fan and back openings. There is still hot air around the motherboard and video card, it seems that the additional exhaust fan doesn't improve cooling performance when set at low speed; when revving faster it helps a bit but it's more than audible.


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Posted by: z24 | Sun, Jun 17 2007 | Category: /hardware | Permanent link | home
Tagged as: , , , ,


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