New case mod. Quiet, clean, cool, easy.

Bluefront

Golden Member
Apr 20, 2002
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I hope this is a new mod, I've never seen it applied anywhere else. I have two tower cases set up this way and they both work excellent. I am going to bring air into the case straight up through the bottom, through an air filter. If you replace the front case fan with this setup, the sound is lessened considerably.

This requires that you raise the case off the floor. I accomplished this with a set of 1 1/2" stick-on wheels from Office Depot. These are normally used on filing cabinets, but work great on computers. They are very sturdy and as a bonus, the computer rolls easily, even on carpet.

I cut a hole in the bottom of the case toward the front, just forward of the cards. There's usually an open space here in most cases. You could move the front case fan to this location, or just add another fan, blowing in. I covered the hole on the outside with a square air filter, sticking it on with two-sided tape on the edges. You can get these filters at hardware stores. They are made for lawn-mowers, about 3/4" thick. The element is paper, like a car air filter. They are efficient, last a long time, and are easily replaceable.

Having the fan on the bottom, rather than the front, really lessens the overall noise. You'd have to hear it to know for sure. Another bonus..You cannot see it at all. No ugly holes in the side or top. The air on the floor is the coolest available, blowing it in rather than out, follows natural air flow (cooler air raises).

Well anyway, works for me. No patents on this, so you're free to gather up the parts and do it yourself. Ideas for improvments gladly accepted!
 

Bluefront

Golden Member
Apr 20, 2002
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Yeah well...The cool air off the floor blown into the case is heated by the computer and rises up, blown out the top by the PSU fan. Sorry for the confusion.
 

Bluefront

Golden Member
Apr 20, 2002
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Never took any pictures. It's not an appearance mod. I tried it on the first case because I couldn't fit a decent filter in front of the front case fan. These pleated-paper lawn-mower filters are the exact size in front of an 80mm fan. Plus they work much better than thin foam filters. My cases stay clean now. The noise of this fan is muted greatly if the computer sits on carpet, less so if it's on a hard floor. I cut the new hole using a nibbler, so I didn't even have to remove anything to do the mod . (except the side cover of course)
 

CubicZirconia

Diamond Member
Nov 24, 2001
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Putting a case fan on the bottom of your case is nothing new. My friend purchased a case with this setup.
 

Bluefront

Golden Member
Apr 20, 2002
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Heh. I'm sure there are cases with fans on the bottom. I've just never seen any. I've just given you a way to do this mod for about $20, if you can cut a small hole. Like everyone else reading this forum, I'm interested in case modification. If you can provide links to pictures of a setup similar to what I discribed, I'm interested. Maybe I could improve my own setup.
 

IJump

Diamond Member
Feb 12, 2001
4,640
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Nice mod, I haven't heard of that either. I have a supercase with casters on it nad that would probable work for it........I have plenty of room for an 80mm fan in the bottom of my case........
 

Bluefront

Golden Member
Apr 20, 2002
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I found a spare filter I have, like the ones I used. It's for a Briggs & Stratton, No. 5028 (same as #399877S). Cost about $4.50. They get pretty dirty after 2-3 months of moderate use. You can extend their life for quite a while by occasional cleaning with a small vac. I think the casters from OD cost about $13. You could get them in black, beige, and silver. The wheels are all you can see. In one of the cases, I constructed a plastic channel directing the airflow from this fan staight onto the video card...a hot-running ATI AIW.
 

talonts

Member
Jun 27, 2001
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Lots of people have done bottom intakes. My case (see my sig) has 2 bottom 120s and 2 top 120s. I'm seriously considering removing the stock 4 80s, but I'm going to at least wait until I've run the box (I haven't had time to work on it in over a month, so it's still not done).
 

HowDoesItWork

Member
Mar 20, 2001
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Sounds like a neat idea blue. I actually use that filter (or one very similiar) for my lawnmower. Might try this out if when I seal up my new rig it runs a little too warm. Thanks!
 

Bluefront

Golden Member
Apr 20, 2002
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Let me say one more thing about this mod. You are not stuck using these small lawnmower filters. If you wanted, and if you had slightly more clearance under the case, you could actually use an auto air filter. Many different cars use these rectangular filters...many different sizes. You could find one large enough to cover a really big fan or several small fans. You mount the filter with the sealing edge toward the case. That way there is some clearance between the filter and the bottom of the case. The fan or fans then can draw air from the full area of the filter, not just the circular area opposite the fan hole. What this means is the filter can last a long time without getting clogged.

I like the idea of drawing air through a "real" filter. You'd be surprised how much cleaner the inside of the case stays using this setup.

The other obvious advantage is you can add extra fans to cases that don't have any more built-in fan holes. I don't like the looks of fan holes anyway....This setup is completely hidden plus if you don't like the setup, you just cover the holes up any you're back to OEM.
 

Underclocked

Platinum Member
Oct 9, 1999
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This is something I've considered doing many times but have never quite got around to it (fancy that ;) ). I had thought to use something like the thinner home hvac filters from Wal-Mart or the like - or you could make a little rack for used dryer sheets. Some type of simple retainer should be an easy add-on.
Good job on actually doing the mod Bluefront - rather than just procrastinate like me. :)