well, if you use a door handle kit, the holes are big, which is why you cover them with vents. If you are just drilling holes, not installing a store bought vent, then the holes are the size of whichever drill bit you have chosen.
What I meant when I said 'seal' was seal the edges of the holes, not the holes themselves. After going through the trouble of sealing the inside of a plywood enclosure, why risk having moisture enter the plywood anyway via the holes you have drilled for vents
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