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 Post subject: Fan location in regards to filter
PostPosted: Mon Oct 27, 2008 1:30 am 
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Joined: Fri Oct 03, 2008 12:29 am
Posts: 15
Location: Norway
Hi

Not sure this is correct part of the forum, if not, please move it.

As showed in picture, I want a fan to suck through a filter, but I am unsure where to place the fan in regards to the filter. In the picture I've drawn 3 options.

1.Perpendicular on filter
2.Paralell
3.Diagonal

What I am worried about is mostly adequate airflow.


Image


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 Post subject:
PostPosted: Mon Oct 27, 2008 2:59 am 
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Joined: Fri Oct 03, 2008 12:29 am
Posts: 15
Location: Norway
Btw, the filter in question is a 3M filtrete filter, how much "fan power" is needed to suck through it ? (Hard to say I guess, but maybe someone on this forum have tested..).


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 Post subject:
PostPosted: Mon Oct 27, 2008 4:15 am 
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Joined: Fri Oct 03, 2008 12:29 am
Posts: 15
Location: Norway
Bump:)

Been searching, seems a guy named Bluefront should have a say about this.. Mr.Bluefront; I humbly beg your advice!


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 Post subject:
PostPosted: Mon Oct 27, 2008 6:12 am 
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Joined: Fri Mar 14, 2008 5:18 am
Posts: 494
Location: London, UK
Make the filter surface area a multiple of the cross-sectional area of the fan and you shouldn't worry too much about fan power. I'd go for something similar to option 1.


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 Post subject:
PostPosted: Mon Oct 27, 2008 10:40 pm 
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Joined: Fri Oct 03, 2008 12:29 am
Posts: 15
Location: Norway
Thanks for the reply, I initially wanted to go along option 1, assuring that others have the same view.


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 Post subject:
PostPosted: Wed Oct 29, 2008 1:45 pm 
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-- Vendor --

Joined: Sat Aug 13, 2005 2:46 am
Posts: 137
Location: Central London, England
Hi,


I really don't believe it make any difference. I go with whatever is easiest to build.



Peter

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PaQ


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 Post subject:
PostPosted: Sat Feb 14, 2009 5:24 pm 
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Joined: Sat Feb 18, 2006 6:57 pm
Posts: 30
I think the air filter media that Bluefront posts about is the same spun-glass filter media I use.

It's quite good for noise-isolation directly in front of the fan. I think the 'pleated surface' helps a bit, by providing most of the media surface at a 45-degree plane relative to the front face of the fan. The actual media thickness is about 1/8" thickness fiberglass backed by soft wire reinforcing mesh. The actual surface area, due to the pleating, is larger than for non-pleated media.

If I'm seriously listening for it, I can still my front fan start up and also very faint seek-noise from my suspended drive, but it's really minimal.

If I knew a better solution, I'd post about it.

Hipe this helps!


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