Since you have to reduce the footprint, the flow rate will go down with it unless you increase the RPM, which means you replace it with a smaller fan, but higher RPM (~more powerful). Essentially flow rate is proportional to Diameter^3 * RPM. You would also need to consider the pressure you...
flow rate is directly related to fan diameter (~ blade length), and RPM:
Q ~ D^3 * RPM
use google and enter fan laws, you should find enough web site with some basic info on this.
You can pretty much scale fan performance using the basic fan law:
flow rate (CFM) ~ diameter^3 * RPM
pressure (in water) ~ diameter^2 * RPM^2
power (hp or kw) ~ diameter^5 * RPM^3
Would like to know how to scale the above with fan thickness, given axial fans?
KM
