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 Post subject: Case fan exhaust vent duct concept
PostPosted: Sat Feb 16, 2013 8:10 pm 
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Joined: Tue Sep 18, 2012 12:39 pm
Posts: 100
Location: Canada
Any thoughts on this? Sorry for the horrible drawing. Imagine the outer border is the case body, with an opening at the back/top. I remember reading somewhere that fans should have a certain amount of clearance. Seems like it was about 10 mm or so? The point of this is that it would direct noise out the back, and hide the vents for aesthetics.

I guess I could shorten the length of the duct/chamber so that it ends at the edge of the fan nearest the front.

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 Post subject: Re: Case fan exhaust vent duct concept
PostPosted: Sat Feb 16, 2013 8:16 pm 
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Joined: Mon Dec 28, 2009 1:42 am
Posts: 343
Location: Australia
Worked fine for me with a single fan. I'm not sure about doing the whole top panel with 2x fans though.

http://tinypic.com/view.php?pic=j8ejyc&s=5
http://tinypic.com/view.php?pic=sfyzol&s=5
http://tinypic.com/view.php?pic=nl4ln4&s=5


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 Post subject: Re: Case fan exhaust vent duct concept
PostPosted: Fri Feb 22, 2013 8:19 am 
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Joined: Tue Sep 18, 2012 12:39 pm
Posts: 100
Location: Canada
Cool, thanks for the links!

With my design, I have a rear slot (84 x 8 mm) and two top-side slots ((160 x 3 (maybe a bit too thin)) x 2). This gives me a surface area of 1632 mm. However, the vent chamber (above 2x 80mm fans) has a volume of 142272 mm. I wonder if this would be sufficient free area for airflow to escape, or be pushed out efficiently by the two 80 mm fans? In contrast, if I had 4 mm circle cutouts right on the top for two 80 mm fans I get an area of about 5428 mm.


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