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05-17-2007, 11:28 AM
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#1
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It's not really that small...No, seriously.
Join Date: Feb 2004
Location: Florida
Posts: 1,047
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To get a PC fan to reverse direction?
Hey everyone, Im building my own laptop cooler and have question. I want to use a blower style fan to keep the cooler to a minimum size, but I need these fans to suck in, instead of their natural ability to blow out.
If I just switch the positive and negative wires will I accomplish this without any ill effect?
Here is a pic of the fan I want to use, just a typical blower style fan with a pos and neg wire to power it.
__________________
'02 GTI
[Routis '04] [Opus 90W] [160GB Maxtor HD]
[Lilliput 7" TS] [VIA M10000] [XMPCR]
[512MB RAM] [Custom housing]
[Deluo GPS Mouse] [E-MU 0404 Soundcard]
Progress Meter: [==============|] 99.9%
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05-17-2007, 11:34 AM
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#2
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Takes it in the Rear
Join Date: Dec 1969
Location: Where the penguins and polar bears live.
Posts: 686
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It depends on the fan , some fans have some sort of an electronic circuit in it , and if you plug it in backwards it doesn't work.
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05-17-2007, 12:27 PM
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#3
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Super Moderator
Join Date: Apr 2004
Location: USA
Posts: 3,688
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Flip the fan around. 
__________________
AMD XP 2600+/512MB RAM/120GB hard drive
Opus 150W/DVD/GPS/7" Lilliput TS/802.11g/Bluetooth
Installed.
-GPSSecure- - GPS Tracking
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05-17-2007, 12:54 PM
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#4
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Constant Bitrate
Join Date: Dec 2004
Posts: 138
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Even if it does spin in reverse when you switch the pos and neg it will not move much air as the blades are designed to push air in one direction only, only way to reverse it is to take the fan out and flip it if posible.
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VIA MII10000, 512mb, EVGA MX4000, Xenarc 700TSV, M1-ATX PSU
G.Skill 64GB SSD, Panasonic slimline slotload CDRW/DVD ROM
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05-17-2007, 01:52 PM
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#5
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Maximum Bitrate
Join Date: Jun 2005
Location: Oakland, CA
Posts: 531
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Quote: Originally Posted by shiltz  Even if it does spin in reverse when you switch the pos and neg it will not move much air as the blades are designed to push air in one direction only, only way to reverse it is to take the fan out and flip it if posible.
 , but you can't take it out and reverse it. With a regular box fan, you can just point it in a different direction, but not the fan you posted.
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05-17-2007, 09:08 PM
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#6
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Bowel movement
Join Date: Dec 2003
Location: not sure yet.
Posts: 1,644
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Quote: Originally Posted by xBrady Flip the fan around.
lol, i was thinking the same but he wants the side vents prob to blow not suck.
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05-17-2007, 10:09 PM
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#7
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Rub One Out
Join Date: Apr 2004
Location: Hertfordshire, England, Earth, Solar System
Posts: 919
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buy a left hand fan?
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CarPC status: iPod, 3,456,217 songs so **** you
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05-17-2007, 11:59 PM
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#8
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Super Moderator. If my typing sucks it's probably because I'm driving....
Join Date: Oct 2004
Location: NY
Posts: 6,102
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Quote: Originally Posted by shiltz Even if it does spin in reverse when you switch the pos and neg it will not move much air as the blades are designed to push air in one direction only, only way to reverse it is to take the fan out and flip it if posible.
that is just not true, a fan like that will reverse airflow with reverse rotation, as will most any fan, the blades are pitched at an angle that will cut & move air one way or the other..., if it was a squriel cage design then it'd be affected by housing etc, but not one like this...
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05-18-2007, 12:29 AM
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#9
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Takes it in the Rear
Join Date: Dec 1969
Location: Where the penguins and polar bears live.
Posts: 686
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Quote: Originally Posted by turbocad6 that is just not true, a fan like that will reverse airflow with reverse rotation, as will most any fan, the blades are pitched at an angle that will cut & move air one way or the other..., if it was a squriel cage design then it'd be affected by housing etc, but not one like this...
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05-18-2007, 02:17 AM
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#10
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Raw Wave
Join Date: Apr 2000
Location: Surrey, UK
Posts: 2,129
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Quote: Originally Posted by turbocad6 that is just not true, a fan like that will reverse airflow with reverse rotation, as will most any fan, the blades are pitched at an angle that will cut & move air one way or the other..., if it was a squriel cage design then it'd be affected by housing etc, but not one like this...
It will probably move air, but not as much. The blades are designed to work in one direction. They have a slight curvature to them that will be reversed if working in the other direction.
Don't believe me? Just got and look at the blades on a fan to see the curvature.
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05-18-2007, 09:11 AM
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#11
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Super Moderator. If my typing sucks it's probably because I'm driving....
Join Date: Oct 2004
Location: NY
Posts: 6,102
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yeah, the blade scoop, but that amounts to maybe a 10% difference in airflow, if that much even... it will still flow air in both directions no problem even though it may be optimized for one direction or the other...
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05-18-2007, 12:22 PM
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#12
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It's not really that small...No, seriously.
Join Date: Feb 2004
Location: Florida
Posts: 1,047
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Hmmm, damn. Does anyone know if they make 'blower' style fans that suck in instead of blow out?
__________________
'02 GTI
[Routis '04] [Opus 90W] [160GB Maxtor HD]
[Lilliput 7" TS] [VIA M10000] [XMPCR]
[512MB RAM] [Custom housing]
[Deluo GPS Mouse] [E-MU 0404 Soundcard]
Progress Meter: [==============|] 99.9%
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05-18-2007, 01:17 PM
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#13
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Newbie
Join Date: May 2007
Location: Maryland
Posts: 1
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I don't know that they make fans that suck vs blow, however you can just reverse the blade. I had to do this when I installed liquid cooling in my PC at home. It was a fairly simple operation I just unscrewed the fan and cover on the radiator flipped it and screwed it back on.
If this is your case fan and there is place to screw it in on the outside you could just mount it backwards on the outside.
Air cooling sucks anyway use liquid cooling. That's what I use, so efficient and cool.........................
Last edited by Lowell; 05-18-2007 at 01:20 PM.
Reason: Added Text
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05-18-2007, 09:59 PM
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#14
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It's not really that small...No, seriously.
Join Date: Feb 2004
Location: Florida
Posts: 1,047
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After searching far and near, low and high, looks like I found the fan for me!
http://www.evercool.com.tw/products/nb_ma1.htm
A sucking blower style fan!
__________________
'02 GTI
[Routis '04] [Opus 90W] [160GB Maxtor HD]
[Lilliput 7" TS] [VIA M10000] [XMPCR]
[512MB RAM] [Custom housing]
[Deluo GPS Mouse] [E-MU 0404 Soundcard]
Progress Meter: [==============|] 99.9%
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05-18-2007, 11:29 PM
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#15
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I see dead kittens
Join Date: Dec 2003
Location: New York
Posts: 2,922
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Quote: Originally Posted by xBrady Flip the fan around.
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Lilliput 7" - Rikaline 6010
[00000000000001100010-] 98% Completed
Check Out My Install!!!
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