David,
Increasing the fan size may not make much difference. More important
that the size of the fan is it's CFM rating (cubic feet per minute).
CFM is a measurement of how much air the fan can move (or displace).
A six inch fan with a CFM rating of 50 will be less effective than a
three inch fan with a CFM of 60.
The second thing to consider is the holes in the grill. If you drop
in a larger fan, then you will also need to enlarge the grill to
allow for the extra air flow.
Jim Meagher
==========
Micro Solutions Consulting Member of the HTML Writers Guild & the
[log in to unmask] International Web Masters Association
==========
> -----Original Message-----
> From: PCBUILD - PC Hardware discussion List
> [mailto:[log in to unmask]]On Behalf Of David Brenner, Ph.D.
>
> I need to increase air flow thru my Enlight Mid-Tower Case.
>
> I want to replace the two 3" fans with two 3.5" cooling fans.