fans for bottom rad question

[Sumoquirkey]

So its time to overhaul my first water cooling build been a few years and the fluid is looking mucky to say the least ! ive a new 240mm rad to add to the system which fits nicely in the bottom ,big phantom case.
It currently has a 360mm rad in the roof with the fans pulling air out ,mid case fan inside, and also a large front fan pulling air in ,so I was wondering is it best to have the new rad fitted with fans on top pulling air into the case or under the rad pushing or pulling ? the case has a pull out filter directly under where the rad is going cheers in advance Q

 

[TechMinerUK]

So its time to overhaul my first water cooling build been a few years and the fluid is looking mucky to say the least ! ive a new 240mm rad to add to the system which fits nicely in the bottom ,big phantom case.
It currently has a 360mm rad in the roof with the fans pulling air out ,mid case fan inside, and also a large front fan pulling air in ,so I was wondering is it best to have the new rad fitted with fans on top pulling air into the case or under the rad pushing or pulling ? the case has a pull out filter directly under where the rad is going cheers in advance Q

From your post I gather that you have 3 fans exhausting air and 2 fans intaking air with one of them being larger than the others. What you want is positive air pressure so dust is less likely to settle or be pulled in through holes in the case that arent filtered. Because of this you would be best having the new radiator fans intaking air so the air pressure is positive. Also since their intake will be filtered and the filter is easy to remove it should help as you can easily clean it

 

[pastymuncher]

Any fans mounted in the top of the case should be exhausting. Hot air rises so needs to be got out of the case.