FatBurger:
2 fans in series are most like two batteries in series: doubles the static pressure (potential) but not necessarily the airflow (current). Thus with no resistance to airflow, what you say is true. WITH resistance however, airflow IS increased due to the higher pressure to push through the resistance. Losses through the fans limit the effectiveness to less than 2x a single.
We poor ME's always had to ask for the mechanical analog to understand anything electrical. Looks like you EE's didn't trouble yourselves with things mechanical.
see details here:<A HREF="http://www.sunon.com.tw/index_en.htm" target="_new">http://www.sunon.com.tw/index_en.htm</A>
This is not to say that sticking a 80mm, 60CFM Delta on top of a 60mm, 20 CFM Coolmaster is a good idea any more than putting 8x1.5 Volt C cells in series with your 12V car battery is going to "jump" start your car :frown: . The resistance of the small battery or fan will limit the total flow no matter what the voltage or pressure of the big one. (not the perfect analogy, but you get the picture)
BW
the more I learn, the less I'm sure I know...