If you have decent 12v power available a 120mm fan would probably work fine. If you want something that doesn't require electricity you could use a scooter fan bolted to the flywheel and make a duct.
If you have decent 12v power available a 120mm fan would probably work fine. If you want something that doesn't require electricity you could use a scooter fan bolted to the flywheel and make a duct.
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