Exhaust fan

[Sc00by]

Hi

Looking at upgrading my current 140mm exhaust fan on the rear of my case, is their a type of fan that is designed specially for exhausting air?

Also whould having one of them Pcie exhaust fans be a good shout as an extra or are they pointless?

 

[Sc00by]

Upgrade for what reason. Quieter, more air flow?
To do either you'd need to know what your current fan is capable of.

The current fan, came with the case it's a corsair one about 3 years old but not sure on the model.
Looking for more air flow extraction noise factor isn't a issue really.