No way to tell how well your fans are performing without a flow meter. About the best thing you can do is throw a piece of paper or a business card in the front side radiator fins while the fans are on to see if the card/paper stays on. The best dual fans that flex-a-lite makes that fit our application are rated from 2500 to 3000 CFM and draw a lot of amps. I had a flex-a-lite set-up but ended up going with something else.
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