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How would I change the fan direction on a laptop

by hotshot3510 / January 1, 2009 3:09 AM PST

How would I change which way the internal system fan blows in my IBM T42 laptop. Preferably without having to mess with any hardware.

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About the only way I can think of
by Steven Haninger / January 1, 2009 7:49 PM PST

is to physically turn the fan upside down. You cannot just reverse the leads on most of these fans. My thought is that, if the engineers thought a reversal of air flow was beneficial, they would have designed it that way in the first place.

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Changing Fan Direction?
by fjbirdman / January 1, 2009 8:56 PM PST

Changing the Fan direction is a BAD idea. The Fan was designed by an engineer to REMOVE heat from the unit in the best possible way...and all of the fins and parts were created around the idea of maximum HEAT REMOVAL. To reverse the fan would likely allow the HEAT to be trapped inside and even raising the inside tempurature by a few degrees can spell Processor Meltdown! Why would you want to change the fan direction?

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re:why?
by sharxbyte / January 19, 2009 11:58 AM PST

The reason you would want to change the fans direction is fairly simple. Nearly all laptops were designed with a ventilation flaw- The fans suck air from the bottom, and blow air out the side. This is detrimental to the laptop, because uneducated people set their laptops on beds(and other such furniture), and the laptop acts like a vacuum, sucking it into the heat-sinks and eventually causing the laptop to overheat. Aside from using a real vacuum to routinely remove dust, or opening the laptop up every 6 months(not a good idea if your inexperienced or your laptop is still under warranty) to remove the dust, you could change the way the fans work, and majorly slow(not stop) the accumulation of dust.

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Fan/etc
by Phil Crase / January 19, 2009 10:53 PM PST
In reply to: re:why?

That is why they are now called NOTEBOOKS instead of laptops. And where is the HEAT going when the fan is reversed? Heat is probably the worst enemy of a Notebook, next to a spilled soda, etc.

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Two Methods
by Renegade Knight / January 20, 2009 3:44 AM PST

Turn the fan around in it's location if the mounts let you do that. The other way is to reverse the leads. Since the fan runs on DC power this should make the fan turn the other direction. The first would be the most efficient. The second method less so since the fan blades may be optimised for the intended direction of flow.

That said, not sure why you would do that though the post about the design flaw gives some good reasons.

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Don't reverse the leads
by Steven Haninger / January 20, 2009 4:17 AM PST
In reply to: Two Methods

You could damage the fan. These don't generally us brush type motors.

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