Cooling CPU on Rotax 916is

My friend has a 750 with a fuel injected Rotax.  There are 2 potted electronics boxes on the side of the Motor's computer.  They get hot, and we are going to put in cooling ducts and tubes to direct the air in the top cowling.

Is there a need to put something in the duct to prevent water from rain etc. getting to the electronics?  What are the tricks for doing this?

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Thanks,

Greg

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