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This is th Spal fans I have and they are not enough cooling for my application.:( I'm having a race shop fabricate an aluminum mount shroud so it pulls through the whole radiator. I presently have to have them both running full blast on a 14.1 volt system and they don't keep up in hot weather. Which also required me to install a 106 amp alternator
#30100846 Dual 11 Inch Spal Fan - (Pull) 16.26" 23.46" 4.25" 2780 CFM
For medium powered cars like 500 hp big blocks they might be OK!