StuckAgainSteve
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Water and dirt ingress, I wouldn't even have an opening in the top surface, mine are at the side on the sloping edge.
That's why my fan mod is sucking through a small number of small holes - keeps the likelihood of dirt and water ingress down. And the externally mounted fan itself stops water that's accumulated on the EAS box lid from trickling into the holes. I wouldn't drill any holes over where the electronic trickery lives, my fan is there to suck the heat away from the compressor head instead of allowing it to heat the interior of the box.