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Author Topic: 120mm vs 80mm blowhole?  (Read 1828 times)

chaos731

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120mm vs 80mm blowhole?
« on: May 07, 2004, 08:40:41 AM »

OK...so here's the deal...
I've got this extra 120mm fan, and I can't think of anything to do with it.
I thought I would put it in my case, but the only place I can think of is as a blowhole on top.
But, I was going to put an 80mm cold-cathode fan up there, because it would look slick, and send the light down into the case. Problem is, the way the cc fan is built, you can't turn it around to make it a blowhole fan (the cc tube sits in this little channel that runs around the perimeter of the fan, and it butts up against the underside just enough to make it impossible to flip).
The question is, should I just put the 120mm fan up there, and use the 80mm cc fan as an intake fan somewhere else? Or, would the the 120mm fan serve me better as an intake fan?
Thoughts?
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infinitevalence

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120mm vs 80mm blowhole?
« Reply #1 on: May 07, 2004, 12:12:30 PM »

yes
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chaos731

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Ummmm
« Reply #2 on: May 07, 2004, 12:15:19 PM »

Quote from: infinitevalence
yes


Ummmm...yes to which part?

could ya' be a bit more specific?

Thanks.
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infinitevalence

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120mm vs 80mm blowhole?
« Reply #3 on: May 07, 2004, 12:51:52 PM »

Both are good options.  more are in means less dust in the system, more air out (ontop) means less heat in the system.  i would use the 80 for an intake some where you can see it, and the 120 as a blowhole but either one will work.
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chaos731

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120mm vs 80mm blowhole?
« Reply #4 on: May 07, 2004, 12:59:51 PM »

Oh...
That makes more sense.

Thanks.
Yeah, I already have a 70mm intake fan on the side panel which should blow on the gpu area, but I'm installing a window (kind of backward L shaped) next to that. Maybe I'll slap that 80mm cc fan kind of bottom center in the window, so it will follow the whole bottom to top thing.
One other thing, my case doesn't have a bottom front intake fan. It's a weird case, and while it has a place for the fan, installing one there wouldn't be terribly practical or effective because of the layout of the bezel. So, I won't have air blowing directly across the hd's. However, I have installed an aluminum vantec dual fan hd cooler on my boot/workhorse drive, so that ought to help things a bit.
Any other thoughts?
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infinitevalence

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120mm vs 80mm blowhole?
« Reply #5 on: May 07, 2004, 01:32:48 PM »

Not at the moment, it seems that you have a decent idea of how you want to cool your system.  Just use the common sense you seem to posess.  Play with things and see what gives you the best tempreturs some times turning around fans can make big differeces.
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Archaon

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120mm vs 80mm blowhole?
« Reply #6 on: May 07, 2004, 06:55:57 PM »

As I understand it:

- The 120mm is bigger than the 80mm (yeah, really!).

- Because of this, it pumps out more air per revolution than than a 80mm fan.

- Which means that you can get the same CFM as a 80mm at a slower speed (less noise); or pump out more CFM at the same noise as your 80mm.

- Or ramp it up to max and have a noisy fan. :P

The higher CFM/less Dba is why many newer cases use a covered 120mm fan at the front intake, and some are starting to use them at the back in place of your normal 80mm (though some cases use 2 80mm fans... :?).
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kaffine

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120mm vs 80mm blowhole?
« Reply #7 on: May 07, 2004, 06:59:59 PM »

Quote
One other thing, my case doesn't have a bottom front intake fan. It's a weird case, and while it has a place for the fan, installing one there wouldn't be terribly practical or effective because of the layout of the bezel.


It may be that the air is pulled in through a slot on the underside of the bezel, the bottom of the case.
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Osse77

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120mm vs 80mm blowhole?
« Reply #8 on: May 07, 2004, 07:09:05 PM »

Good luck cutting the blowhole with a dremel, (i find it a little messy), because the biggest holesaw ive seen is a 3incher, the perfect circumference for an 80mm fan.
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chaos731

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120mm vs 80mm blowhole?
« Reply #9 on: May 08, 2004, 07:12:31 AM »

Quote from: Osse77
Good luck cutting the blowhole with a dremel, (i find it a little messy), because the biggest holesaw ive seen is a 3incher, the perfect circumference for an 80mm fan.


Yeah, well, I actually have a Dremel. I don't have a drill powerful enough to reasonably run a hole saw.  The only drill I have is a ten year old cordless model. I'm not going to invest in  a drill so I can invest in a hole saw just so I can use them once.
The Dremel takes some "finesse", to be sure, but as long as I go reaaaallly slow, and take some time to clean up the edges really thoroughly, it should be ok.
Maybe some day it'll make more sense to buy a new drill and hole saw (and if I ever get that mod-shop off the ground, I'll definitely get some new tools), but for now, Dremel is my first and only friend.
 :cry:
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