Battery powering fans

[GreatestOne]

technically, 2 fans in series (wired in series) would be the same amp draw but will spin at half speed.
2 fans inline wired in parallel would be same voltage and double the amp draw.

I meant parallel, ya, I would need the max fan speed, thanks for clarifying.

There are links to datasheets on Digikey's site on each fan's page. The better manufacturers specify both a minimum and maximum voltage. The lazy ones give only a single nominal figure.

Of course the one 5V fan that offers over 40CFM only has a stated votage of 5V, but no "operational voltage" range like some other fans do in the spec sheets ugh... great.

static pressure is going to be a large problem and a bigger issue than open air cfm.

Sorry, how will static pressure be relevant here? What I can tell you is that the fan(s) will be setup basically like a wind tunnel setup, almost like a vacuum cleaner, blowing (or sucking from the other end) air from one end to the other.

filter link for ya,,,
http://www.lacool.ws/air filter tutorial.htm

Thanks! Very helpful....