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This may sound like a silly question but i would like to know if case fans should be blowing air into the case or blowing air out. i have them blowing in

Blowing out Kibz, blowing in means your gonna get all kinds of household dust and trash in.

Well you can get intake fans on the front with filters.

Very true Upgrader, sorry about that Kibz.

Ive tried it both ways, and it doesnt seem to make much difference on cooling, or the amount of dust in the case. It still draws the same amount of outside air(dust) into the case either way. Airflow over the components seems to be about the same, and the temps too.

I usually have the one in front blowing in-- and the rear blowing out... the "idea" is air flow. Cool air comes in, absorbs heat from heatsinks/video cards/ harddrives-- and flows out again ...taking the heat from those components with it. Heat is a component's enemy.
That's why "neatness" is encouraged when building PC's--

cables neatly wrapped and tucked away.

Components well-spaced when possible.

Rounded cables are better than flat... better-made (stronger) more flexible(easier to control) smaller profile (more air flows through)

Any hardcore-gamer will tell you-- unless he has a water-cooled rig-- that air-flow/cooling is one of his most important criteria when selecting components for his 'build'.

Gamers push their systems to the limit. This stresses all components to the max. All those expensive parts will last for years-- IF they are kept cool... if not he/she will pay the price...

I have seen this in various forms online:

To demonstrate just how much heat a modern PC CAN generate. see here:

How to fry an egg on an XP

this is -- of course a deliberate attempt to see just how hot a CPU can get. Pretty hot-- I'd say.

and note-- this is no gamer-rig. just a server sitting there "at idle" --not being pushed at all.

thanks for your help guys