The_$@!nt 19:21 13 Apr 04

Forgive me if this sounds considerably stupid, but when you put fans in your case does they always get rid of air or intake it aswell?!

Can a fan be simply changed from intake to getting rid of air?

I would like to install a blowhole in my case(a hole cut out of the top with a fan attached to get rid of hot air), is this worth while?

  Chegs ® 19:28 13 Apr 04

If you take a look at a fans plastic outer casing,you will see at least 8 mounting holes.You simply turn the fan about to create airflow in the relevant direction.As far as direction,setup the fans so you have equal(ish)intake/exhaust airflow.

  Djohn 19:37 13 Apr 04

Not a stupid question at all, in fact it's a good question and many people will be relieved that you have asked.

As Chegs ® says. Fans will revolve in one direction and depending on which side of the fan you are looking at it will be blowing air out or drawing it in.

Ideally the fan/s at the rear of the case should be drawing air out from the case. Fans at the front should be drawing air into the case. This can be achieved with the same type of fan, just turn the fan over to suite. j.

  Graham ® 19:39 13 Apr 04

And position the fans so that air is blowing across the components. With fans close together, one blowing and one sucking, the air will simply short-circuit, and the air will not circulate.

  Gongoozler 19:41 13 Apr 04

The important thing with fans is that they should be giving an air flow across the motherboard, so avoid positioning them so that they simply suck air ino the case and blow it straight out again. Also position ant flat cables so they don't obstruct the airflow any more than is absolutely necessary.

  accord 20:01 13 Apr 04

you also need to make sure that the fans are balanced in such a way so no dead air is held in the case, ie exhausting more air than the one feeding the case.

  Forum Editor 20:11 13 Apr 04

that is they blow warm air out of the case. In doing so a flow of (hopefully) cooler air is drawn in via the slots/grilles/gaps in the case itself.

The bigger and faster the exhaust fan the more cool air is drawn in, and the better the components are cooled. Fans that are mounted on components like CPUs and Graphics cards simply move air rapidly across the heat source, and this 'spot' cools the component. The air thus warmed is then removed by the main exhaust fan(s).

Beware of making too many holes in the case - or removing the case side completely. Many people think that if they take the case side off the components will cool better - this couldn't be further from the truth. What you should aim for is a rapid and constant flow of air being drawn across the whole of the interior of the case, and this is best achieved by having exhaust at the back (where it won't annoy anyone sitting in front of the machine) and intake at the front. The ideal would be balanced intake and exhaust fans - working together to move large and constantly flowing volumes of air through the case.

  Forum Editor 20:14 13 Apr 04

that you don't actually need an intake fan - an exhaust fan will pull cool air in without any help. Having an intake fan with no exhaust would simply mean that you would be trying to compress the air in the case, and the fan would have little or no effect.

  The_$@!nt 20:15 13 Apr 04

Would it be worth putting a blow hole on top or not??

  Gongoozler 20:22 13 Apr 04

It's very unlikely this would help. As I said before, you are trying to create a flow of air across the motherboard. Don't forget also that the power supply fan is also usually drawing air across the motherboard. Generally there are no components at the top of the case other than the power supply and cd drives.

  daba 21:05 13 Apr 04

Any way round, if the air coming out is warm, then the fan(s) is(are) probably doing the job.

As the FE said, if air is coming out (or going in) then the same amount of air must be going in (or coming out). This is a fact of life.

Sometimes people put 2 case fans, one to expell air at the back, and one to suck air in at the front. Some of those 'some people' think they are gonna get twice as much air through than 1 fan. Sorry it don't work that way. Sure there will be a small improvement in airflow, but not twice as much. Think of it as putting another engine in your car, if neither of them could turn fast enough to make the car do 100 mph, then both of them together wont be able to.

Also make sure you fill up the gaps left by PCI cards that have been removed. If you dont, the rear fan just pulls air in to the case through these slots, and the airflow completely misses the mobo. If you have got any slot fillers, use masking tape or similar, but block it up somehow.

Periodically clean the fan blades. A build-up of dust on the blades can dramatically reduce a fan's efficiency. Best done with a hoover (or an electrolux, or a dyson) and a CLEAN, DRY paintbrush. (Make sure PC is OFF).

Also if you feel OK to do it, (and only if you are confidant!), take fan off the CPU and clean out the fins of the heatsink. When these get blocked with household dust, then the airflow stops, and goodbye CPU. Same goes for any heatsink fins on GPU (graphics processors).

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