I used a 6 inch 12v fan on mine. I am not sure what the cfm is but the fan has decent pitch in the blades and sounds like it is moving a bunch of air. Mine is mounted directly to the brush cover on the etek. I would like to use an 8 or 10 inch with a duct around the whole motor. I would like to know which direction the internal fan is moving the air as to not conflict with it.
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