I think the key issue is "push" under resistance. I don't expect most computer fans (even in a bank) will do well with the resistance of ducting and the wet mat. (my first attempt at a bucket swamp cooler had little air movement.) Automotive radiator fans can use a lot of amps, and the ones I tested...

I'm building a full scale swamp cooler & having no junk yards handy to just grab 'whatever' is lying around, is there a known low amp model that's ideal?
Variable speed?
Thanks!
Mankx

I'm making a substantial swamp cooler (not a bucket type) and trying to pick the most efficient cost/cfm/min Amperage fan. (powering with Harbor Freight 45W solar rig {I think I can add up to 3 more panels on the same controller}, along with a hefty deep cycle marine battery) --I understand the duct...