[SOLVED] Fans

[Dangiurus]

Which would be better on the front of the case: 3x120mm fans or 2x140mm fans ?

 

[digitalgriffin]

The answer is yes.
In other words, there are too many variables to give you a correct answer.

Which two model fans, placement and which case and what other components?

As a general rule of thumb, a similar product line (For example two cooler master AF 120 versus AF 140) will result in closer to similar airflow, but the 140 will be quieter provided they are stuck in the same area. The quickest way to tell is look at the CFM of each fan and add them up. But remember CFM isn't everything. Noise is important too.

That said a 120mm fan has roughly 71% of the surface area of a 140mm fan the time 40mm hub is taken into account.

 

[Dangiurus]

The answer is yes.
In other words, there are too many variables to give you a correct answer.

Which two model fans, placement and which case and what other components?

As a general rule of thumb, a similar product line (For example two cooler master AF 120 versus AF 140) will result in closer to similar airflow, but the 140 will be quieter provided they are stuck in the same area. The quickest way to tell is look at the CFM of each fan and add them up. But remember CFM isn't everything. Noise is important too.

That said a 120mm fan has roughly 71% of the surface area of a 140mm fan the time 40mm hub is taken into account.

Thanks man , I will check it.

 

[curiousmcgeorge]

The answer is yes.
In other words, there are too many variables to give you a correct answer.

Which two model fans, placement and which case and what other components?

As a general rule of thumb, a similar product line (For example two cooler master AF 120 versus AF 140) will result in closer to similar airflow, but the 140 will be quieter provided they are stuck in the same area. The quickest way to tell is look at the CFM of each fan and add them up. But remember CFM isn't everything. Noise is important too.

That said a 120mm fan has roughly 71% of the surface area of a 140mm fan the time 40mm hub is taken into account.

I have two 120s for intake (on teh front adjacent to each other) (plus the PSU) and will buy an extra fan for exhaust (upper rear), to maintain positive pressure.

Would a 140 be ok as an exhaust fan?