Antec 900 200mm exhaust fan problem

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EvanVanVan

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Jul 2, 2013
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I just built a system in the Antec 900 case, and I'm having an exhaust problem with the top 200mm fan. There is none, or very little. I believe the problem is that the Cooler Master Hyper 212 Evo I'm using lines up almost perfectly with the 120mm exhaust fan. I get awesome exhaust out of the back fan, but I think the lack of air pressure in that air stream is screwing up the 200mm fan.

The fan has l/m/h settings, on low sometimes it fails to start completely. On medium and high, the RPM's raise above 500+ RPM and the fan status in the bios (the mb is a Asus Sabertooth X79) goes red (indicating a problem I think). I can upload some pictures or something if necessary.

As I said, putting my hand or face up against the 200mm fan I feel very little exhaust at all even though it's spinning. My worry is that'll damage the motherboard because the fan will draw too much current trying to work too hard. If it's just going to burn out the fan I don't care as much. is there anything I can do to fix it? Should I leave it in or unplug it (the red status in Bios worries me a little also)?

Thanks

edit: Sorry if this is the wrong section, I thought I had posted it in Cases...please move it if need be. Thanks
 
Solution
makkem
Hi
The fan would only take excess current if the blades were physically prevented from moving .
Because of the surface area 200mm fans do not appear to move as much air as a 120mm but this is because the air velocity is lower and in fact the larger fan moves more air volume but may not feel like it if you put your hand in front.
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makkem

makkem

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Hi
The fan would only take excess current if the blades were physically prevented from moving .
Because of the surface area 200mm fans do not appear to move as much air as a 120mm but this is because the air velocity is lower and in fact the larger fan moves more air volume but may not feel like it if you put your hand in front.
 
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Solution
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EvanVanVan

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Thanks for the answer. As I said on the low fan settings sometimes it fails to start completely. A few of the reviews I read said it was due to not enough torque. I hope that wouldn't cause it to draw excess current if I didn't notice it was a problem right away.
 
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makkem

makkem

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The speed switch on the fan reduces the voltage and current to the fan and this does reduce the starting torque but also means that not enough current flows to cause any damage if it is stalled..
However if you are still worried why not leave it on medium.
 
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EvanVanVan

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I do leave it on medium, but then I see this in bios:

Medium:
9wf5.jpg


High:
dkp1.jpg


and finally, low:
21xf.jpg


Yes, those are the correct RPM's according to the bios. Doesn't make alot of sense, but low is the only one in the blue. Is it possible it's just so low (< medium's 393 RPMs) that it's just not measuring it correctly?
 
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EvanVanVan

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I realize that's what it looks like but for whatever reason that's not the way it is. High has more RPM's then medium (as shown in the photos). But both show up under the low RPM threshold. Low is the only setting that doesn't show up like that, and *supposedly* has more RPMs then both medium and high.
 
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makkem

makkem

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If you go into the Advanced setting on your BIOS and then onto monitoring then onto the low rpm setting and alter the warning level to 300RPM you should lose the red warning but still keep a warning if your fan drops below that.
Looks as if the switch on the fan is working but not according to the H M L legends.
 
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