yes, in one of the ways ... rad fins + rad thickness, creates the restriction for airflow ...
the fan blade design + rpm is creates static pressure.
static pressure is needed to push the air through ... anyhow, if also possible to determine good static pressure axial fans by checking out those fan tested on aircooling heatsinks, their fins are much dense packed


http://martin.skinneelabs.com/The-Fe...80-Review.html

http://www.xtremesystems.org/forums/...artin+fan+test