reverse a fan

  • Thread starter Thread starter GT
  • Start date Start date
GT said:
Does it damage a case fan to reverse its current and make it go
backwards?
Click to expand...

It should not damage it, but at the very least it won't work.

The solution is to remove the fan, turn it around, and reinstall it.

Jon
 
Jon Danniken said:
It should not damage it, but at the very least it won't work.

The solution is to remove the fan, turn it around, and reinstall it.
Click to expand...

I was looking for a quick-fix shortcut - I have custom case cooling and the
fan wires pass through a junction, which i could simply reverse without
dismantling loads of case bits!!
 
GT said:
Does it damage a case fan to reverse its current and make it go backwards?
Click to expand...

I dunno what good about making the current (power current or wind current)
to foreward or backwards?

- Unless it's DC I don't know how you can reverse the wires of AC current?

- I dunno what reverse AC would do differently. But on my system I have
fans sucking air OUT and fan blowing air IN.

And all I have to do is flipping the fan or turning the fan around.
 
Brian Cryer said:
Rather than playing with swapping the connectors, you might find it less
effort to unscrew the fan and turn it round.
Click to expand...

Agree! and that's what I do and responsed in the other message.
Its common (although not that common) to have one fan blowing air into the
case and another blowing it out, but do give some thought to the air flow
pattern inside your pc case.

As to whether it would damage the fan, I don't see why it should but I'm no
expert ...

HTH.
Click to expand...

Here my tower case has 5 fans (1 belongs to the power supply) 2 of them
are the powerful fans I have to use the Fan Controller device to slow them
down else they would make very loud noise (like vacuum and they suck the hot
air out). One out of 2 regular case fan blowing air IN to circulate the
dirt for other fans to suck it out.
 
Brian Cryer said:
Rather than playing with swapping the connectors, you might find it less
effort to unscrew the fan and turn it round.
Click to expand...

I'm fine-tuning my case air flow and made a silly mistake and installed a
the opposite way from my plan! I have finished tidying all the cables and
neatly routed everything and I have a convenient junction box for my fan
wiring - I have 3 fans wired into the same fan speed controller, connected
to a single MB fan header and I was going to cheat and wire the incorrect
fan backwards.

I have now physically turned the fan round.
 
GT said:
Does it damage a case fan to reverse its current and make it go backwards?
Click to expand...
AC: no problem, also no going bckward.
DC: control is with electronics, it wont work and almost
certainly blow the electronics, so not going backward and
probably killed, unless it has a protection diode inside.
 
GT said:
Does it damage a case fan to reverse its current and make it go backwards?
Click to expand...

It won't damage it. It simply won't spin at all. DC fans spin in only one
direction. The blade shape is designed to work moving in only one direction -
the blade pushes air away from the blade's "spoon" shaped side. If you want
to change airflow direction, you'll have to physically reverse the way the
fan is mounted.
 
UCLAN said:
It won't damage it. It simply won't spin at all. DC fans spin in only one
direction. The blade shape is designed to work moving in only one
direction -
the blade pushes air away from the blade's "spoon" shaped side. If you want
to change airflow direction, you'll have to physically reverse the way the
fan is mounted.
Click to expand...



correct

The DC fans will NOT spin if the voltage is reversed
 
philo said:
correct

The DC fans will NOT spin if the voltage is reversed
Click to expand...

And it could make a big celebration if connecting a capacitor in reserved.
Heheheh back in 60's when I was studying electronics, we use to play trick
on each other by during lunch break, we sneaked back to the lab to reverse
the capacitor.
 
Joel said:
And it could make a big celebration if connecting a capacitor in reserved.
Heheheh back in 60's when I was studying electronics, we use to play trick
on each other by during lunch break, we sneaked back to the lab to reverse
the capacitor.
Click to expand...

We used to play tricks on the janitor by charging up a small 1000v cap and
leaving it on the floor at the end of the day. It didn't take long for the
janitor to learn that he should just leave them. Leaving a piece of cookie
between the leads made a nice mouse trap, however.
 
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