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It would be great if you could find out somehow what you have. There are no markings of a brand name on the fan itself? How do you know it truly flows 3500 cfm? That's pretty good if it's true.. By the looks of it, it looks like some sort of SPAL, but they all kinda look the same. And I don't think SPAL makes a fan larger than 16" (yours looks bigger than that).
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