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You should look into a Lincoln MK VIII fan from a late 90's car. On low speed they move ~3,500 CFM. On high they move 5,000+ CFM.
Only draw back is you have to keep kids and small dogs away from the front of the car. Salvage yards part with them very inexpensively. Mine was $25.
Ed
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Help them do what they would have done if they had known what they could do.
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