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Well I was looking onto a blower style fan from a boat. they either 3in or 4in, and are designed be how ducting on them. how ever the 4in on avg flow about 230 CFM, and you could mount them on the firewall. Redesigning the under tray would be hard with out a welder. I also had the idea of computer fans but their flow rate is normally less then 100cfm for a 200mm fan.
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