how do fans work?

[wupwup]

im going to fully ventilate this case

http://www.overclockers.co.uk/showproduct.php?prodid=CA-145-CM

with these fans

http://www.overclockers.co.uk/showproduct.php?prodid=FG-001-NC&groupid=701&catid=57&subcat=4

http://www.overclockers.co.uk/showproduct.php?prodid=FG-004-NC&groupid=701&catid=57&subcat=4

but how do they work? will the first ones sufice or do i need some of the second too? do i just screw them into the case and plug them in? thanks

 

[wupwup]

cheers.they just looked empty. i wondered it there was anything else i had to buy. ilo have a look at a fan bus. i probavbly wont need them but they cant hurt can they? and 8 running at 10% would be quieter than at 20% right?

 

[wupwup]

cheesr guys. i didnt meen power i meant speed (although that may equate to power) but yeah. i guess i dont need them verry fast with that many. and i will probably buy them in instalments as and when i get the money.